uninitialized access wartnings removed:

==33083==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x7f36df113d73 in sc_dt::vec_cmp(int, unsigned int const*, int,
unsigned int const*)
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_nbutils.h:427:3
    #1 0x7f36df113d73 in sc_dt::vec_skip_and_cmp(int, unsigned int
const*, int, unsigned int const*)
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_nbutils.h:500:10
    #2 0x7f36df113d73 in sc_dt::compare_unsigned(int, int, int, unsigned
int const*, int, int, int, unsigned int const*, int, int)
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_unsigned.cpp:2090:21
    #3 0x7f36df13e1ab in sc_dt::operator==(sc_dt::sc_unsigned const&,
sc_dt::sc_unsigned const&)
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_unsigned.cpp:1722:7
    #4 0x7f36df13e1ab in sc_dt::operator!=(sc_dt::sc_unsigned const&,
sc_dt::sc_unsigned const&)
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_nbcommon.inc:1930:13
    #5 0x4ab2d4 in sc_main
/builds/coseda/systemc/systemc-regressions/scripts/systemc/datatypes/misc/concat/test07/./test07/test07.cpp:119:5
    #6 0x7f36dec273e5 in sc_elab_and_sim
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/kernel/sc_main_main.cpp:89:18
    #7 0x7f36dec26f38 in main
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/kernel/sc_main.cpp:36:9
    #8 0x7f36dd41a492 in __libc_start_main (/lib64/libc.so.6+0x23492)
    #9 0x42387d in _start
(/builds/coseda/systemc/systemc-regressions/scripts/systemc/datatypes/misc/concat/test07/systemc.exe+0x42387d)

  Uninitialized value was stored to memory at
    #0 0x7f36def86e38 in sc_dt::sc_signed::concat_get_data(unsigned
int*, int) const
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_signed.cpp:337:26
    #1 0x4b9fae in sc_dt::sc_concatref::value() const
/opt/systemc-latest/include/sysc/datatypes/misc/sc_concatref.h:265:41
    #2 0x4ab087 in sc_main
/builds/coseda/systemc/systemc-regressions/scripts/systemc/datatypes/misc/concat/test07/./test07/test07.cpp:119:5
    #3 0x7f36dec273e5 in sc_elab_and_sim
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/kernel/sc_main_main.cpp:89:18
    #4 0x7f36dec26f38 in main
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/kernel/sc_main.cpp:36:9
    #5 0x7f36dd41a492 in __libc_start_main (/lib64/libc.so.6+0x23492)

  Uninitialized value was created by a heap allocation
    #0 0x4a8abb in operator new(unsigned long)
(/builds/coseda/systemc/systemc-regressions/scripts/systemc/datatypes/misc/concat/test07/systemc.exe+0x4a8abb)
    #1 0x7f36debf6f3b in sc_core::sc_byte_heap::initialize(unsigned
long) /builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/utils/sc_temporary.h:96:19
    #2 0x7f36debf6f3b in sc_core::sc_byte_heap::sc_byte_heap(unsigned
long) /builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/utils/sc_temporary.h:114:3
    #3 0x7f36debf6f3b in __cxx_global_var_init
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/misc/sc_concatref.cpp:55:30
    #4 0x7f36debf6f3b in _GLOBAL__sub_I_sc_concatref.cpp
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/misc/sc_concatref.cpp
    #5 0x7f36df4ae8b9 in call_init.part.0
(/lib64/ld-linux-x86-64.so.2+0xf8b9)

SUMMARY: MemorySanitizer: use-of-uninitialized-value
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/datatypes/int/sc_nbutils.h:427:3
in sc_dt::vec_cmp(int, unsigned int const*, int, unsigned int const*)
Exiting



==39132==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x6ba6ac in tlm_utils::simple_target_socket_b<ExplicitATTarget,
32u, tlm::tlm_base_protocol_types,
(sc_core::sc_port_policy)0>::bw_process::nb_transport_bw(tlm::tlm_generic_payload&,
tlm::tlm_phase&, sc_core::sc_time&)
/opt/systemc-latest/include/tlm_utils/simple_target_socket.h:157:13
    #1 0x69bf2b in ExplicitATTarget::beginResponse()
/builds/coseda/systemc/systemc-regressions/include/tlm/ExplicitATTarget.h:133:19
    #2 0x7ff92cf43a94 in sc_core::sc_process_b::semantics()
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/kernel/sc_process.h:685:9
    #3 0x7ff92cf43a94 in sc_core::sc_thread_cor_fn(void*)
/builds/coseda/systemc/systemc-latest/objdir/src/sysc/../../../src/sysc/kernel/sc_thread_process.cpp:117:23
    #4 0x7ff92d4be4bc
(/opt/systemc-latest/lib-linux64/libsystemc-2.3.4.so+0x6b74bc)

  Uninitialized value was created by an allocation of 'target7' in the
stack frame of function 'sc_main'
    #0 0x4f7fe0 in sc_main
/builds/coseda/systemc/systemc-regressions/scripts/tlm/bus_dmi/./bus_dmi/bus_dmi.cpp:37

SUMMARY: MemorySanitizer: use-of-uninitialized-value
/opt/systemc-latest/include/tlm_utils/simple_target_socket.h:157:13 in
tlm_utils::simple_target_socket_b<ExplicitATTarget, 32u,
tlm::tlm_base_protocol_types,
(sc_core::sc_port_policy)0>::bw_process::nb_transport_bw(tlm::tlm_generic_payload&,
tlm::tlm_phase&, sc_core::sc_time&)
Exiting

src/sysc/utils/sc_temporary.h

@@ -94,6 +94,7 @@ class SC_API sc_byte_heap {
     {
         delete [] m_bgn_p;
         m_bgn_p = new char[heap_size];
+        std::memset(m_bgn_p, 0, heap_size);
         m_end_p = &m_bgn_p[heap_size];
         m_next_p = m_bgn_p;
     }

src/tlm_utils/simple_target_socket.h

@@ -548,7 +548,7 @@ class simple_target_socket_b
   bw_process m_bw_process;
   std::map<transaction_type*, sc_core::sc_event *> m_pending_trans;
   sc_core::sc_event m_end_request;
-  transaction_type* m_current_transaction;
+  transaction_type* m_current_transaction = NULL;
 };
 
 template< typename MODULE, unsigned int BUSWIDTH = 32