[PATCH] Update comments to use unreachable instead of llvm.trap, as implemented now

[Reid Kleckner]

Hi majnemer,

win64: Call __chkstk through a register with the large code model

Fixes half of PR18582. True dynamic allocas will still have a
CALL64pcrel32 which will fail.

http://reviews.llvm.org/D7267

Files:
  lib/CodeGen/WinEHPrepare.cpp
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86FrameLowering.h
  lib/Target/X86/X86InstrControl.td
  test/CodeGen/X86/win_chkstk.ll

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