Make PrologEpilogInserter save/restore all callee saved registers
in functions which call __builtin_unwind_init()

__builtin_unwind_init() is an undocumented gcc intrinsic which has this effect,
and is used in libgcc_eh.

Goes part of the way toward fixing PR8541.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183984 91177308-0d34-0410-b5e6-96231b3b80d8
Remove a use of PathV1.h.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183985 91177308-0d34-0410-b5e6-96231b3b80d8
Convert a use of sys::Path::GetTemporaryDirectory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183987 91177308-0d34-0410-b5e6-96231b3b80d8