Reid Kleckner 8e206c19f4 [X86] Rename some frame lowering variables ...

Old names, new names, and what they really mean:

- IsWin64 -> IsWin64CC: This is true on non-Windows x86_64 platforms
  when the ms_abi calling convention is used.
- IsWinEH -> IsWin64Prologue: True when the target is Win64, regardless
  of calling convention. Changes the prologue to obey the constraints of
  the Win64 unwinder.
- NeedsWinEH -> NeedsWinCFI: We're using the win64 prologue *and* the we
  want .xdata unwind tables. Analogous to NeedsDwarfCFI.

NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239836 91177308-0d34-0410-b5e6-96231b3b80d8

2015-06-16 18:08:57 +00:00

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