lib/Frontend/InitHeaderSearch.cpp: Tweak AddPath() to accept "/foo/bar" (not "X:\foo\bar") with -isysroot. test/PCH/reloc.c can pass.

FIXME: We should consider better isysroot scheme on Win32 hosts.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130683 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed