tsan: set disable_coredump=0 by default for Go

tsan: set disable_coredump=0 by default for Go

Go maps shadow memory lazily, so we don't have the huge multi-TB mapping.
Virtual memory consumption is proportional to normal memory usage.
Also in Go core dumps are enabled explicitly with GOTRACEBACK=crash,
if user explicitly requests a core that must be on purpose.

So don't disable core dumps by default.

llvm-svn: 285451