self.path may be empty or otherwise miss the normal system directories,
so try PATH next. Assume it is sane enough to cover the usual system
bash locations too, but the old list is not good enough for NetBSD.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193471 91177308-0d34-0410-b5e6-96231b3b80d8
lli/RemoteMemoryManager.cpp: Resurrect __main stuff removed in r192504 to unbreak mingw32.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193472 91177308-0d34-0410-b5e6-96231b3b80d8