Cygwin is now a proper environment rather than an OS. This updates the MCJIT
tests to avoid execution on Cygwin. This fixes native cygwin tests.
llvm-svn: 205266
Re-submitting with fix for OCaml dependency problems (removing dependency on SectionMemoryManager when it isn't used).
Patch by Fili Pizlo
llvm-svn: 180720