[ASan/Win tests] Use the env keyword in the SUAR tests to work with gnuwin/lit correctly

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209620 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan/Win tests] Remove the extra 'cat' in front of FileCheck now that it's clear we should use GnuWin32 rather than Cygwin on the PATH on Windows (see PR19744)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209622 91177308-0d34-0410-b5e6-96231b3b80d8
[MSan] Implement __sanitizer_print_stack_trace().

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209625 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan tests] Use ASAN_OPTIONS in a portable way

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209629 91177308-0d34-0410-b5e6-96231b3b80d8
On AArch64, use clone() instead of fork()

Patch by Gideon Billings.

Differential Revision: http://reviews.llvm.org/D3903

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@209641 91177308-0d34-0410-b5e6-96231b3b80d8