[PATCH] [x32] Fix FrameIndex check in SelectLEA64_32Addr

[Pavel Chupin]

Hi nadav, dschuff, t.p.northover,

Fixes http://llvm.org/bugs/show_bug.cgi?id=20016 reproducible on new
lea-5.ll case.
Also use RSP/RBP for x32 lea to save 1 byte used for 0x67 prefix in
ESP/EBP case.

http://reviews.llvm.org/D4929

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86RegisterInfo.cpp
  test/CodeGen/X86/lea-2.ll
  test/CodeGen/X86/lea-3.ll
  test/CodeGen/X86/lea-4.ll
  test/CodeGen/X86/lea-5.ll
  test/CodeGen/X86/lea.ll
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