[ASan] Fix compilation on Mac.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172810 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizer] Remove an unused variable.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172811 91177308-0d34-0410-b5e6-96231b3b80d8
CMake variables renaming: X86_64->x86_64 I386->i386

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172812 91177308-0d34-0410-b5e6-96231b3b80d8