clang/test/Driver/coverage-ld.c: Tweak expressions to match dosish pathsep on win32 hosts.
clang/unittests/ASTMatchers/Dynamic/RegistryTest.cpp: Suppress unexpected failures on MS hosts.

FIXME: A couple of tests have been suppressed.
I know it'd be bad with _MSC_VER here, though.
NVPTXTargetObjectFile.h: Initialize some pointers as NULL in the constructor of NVPTXTargetObjectFile. ~NVPTXTargetObjectFile() tries to delete them.

It caused crash on some hosts since r184595.
llvm/test/DebugInfo/arguments.ll: Add explicit -mtriple=x86_64-unknown-unknown.
llvm/test/CodeGen/X86/legalize-shift-64.ll: Add explicit -mtriple=i686-unknown-unknown.