v1.40.0-sym1-newgc8

Bump SDC to fix fiber issue

v1.40.0-sym1-newgc7

Add quiet option for sdc gc to avoid tripping up CI

v1.40.0-sym1-newgc6

Bump to latest SDC, including all hang fixes. Fix memory leak.

v1.40.0-sym1-newgc5

Add option to set number of threads that parallel scan.

v1.40.0-sym1-newgc4: druntime: Enable DRT_* environment variables support by default

In order to trivially switch between GCs.

v1.40.0-sym1-newgc3

Bump SDC

v1.40.0-sym1-newgc2

Bump SDC

v1.40.0-sym1-newgc1

Add SDC (Steven's fork) as submodule and build its libdmdalloc.a

v1.39.0-sym1

Symmetry: Switch to custom dub and reggae with inheritable dub.select…

v1.38.0-sym4: Merge remote-tracking branch 'origin/master' into sym-1.38.x

Conflicts:
	.cirrus.yml