Driver: Lookup program names using llvm::sys::Program::FindProgramByName 
if our usual methods fail. This isn't necessary for running the tool,
but improves the accuracy of logging output.

Also, have GCC tools lookup gcc program path.

llvm-svn: 67243
2 files changed
tree: 613f2da5f3ca12a6217263509f047453a901a1eb
  1. clang/
  2. llvm/