Fix the alloc_type of allocations performed by declare_var. #1529

[jmpenn]

This is a re-do of PR 1539 associated with 1529.

[coveralls]

coverage: 55.903% (+0.01%) from 55.889%
when pulling 7266758 on Issue_1529v2
into 7547d36 on master.

[hchen99]

MM declare var sets alloc_type and the destructor gets called when delete_var, associated unit shows the intention. All looks good.

[jmpenn]

Also see Issue #1529 for additional comments.