Reorder the header search a bit so that it matches gcc exactly:

*) the ../backward dir is the last in libstdc++ to be searched
*) If compiling c++, the c++ headers are searched first



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89661 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed