MC: split Win64EHUnwindEmitter into a shared streamer

This changes Win64EHEmitter into a utility WinEH UnwindEmitter that can be
shared across multiple architectures and a target specific bit which is
overridden (Win64::UnwindEmitter).  This enables sharing the section selection
code across X86 and the intended use in ARM for emitting unwind information for
Windows on ARM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215050 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Make a test more portable

mach-o doesn't like sections without segments, and elf is perfectly
happy with commas in section names, so use a Darwin-like section name.

Suggestion by Eric Christopher.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215052 91177308-0d34-0410-b5e6-96231b3b80d8