[PATCH] [FastISel][X86] Assign the correct register class to folded operations

[Keno Fischer]

Hi ributzka,

Without this patch, running the given test case using
`llc -fast-isel -verify-machineinstrs -O3` fails with

*** Bad machine code: Illegal virtual register for instruction ***
- function:    julia_ht_keyindex219890
- basic block: BB#3 idxend (0x215ba40)
- instruction: CMP8mr %vreg8, 1, %vreg7, 0, %noreg, %vreg6, %EFLAGS<imp-def>; mem:LD1[%0] GR64:%vreg8,%vreg7 GR8:%vreg6
- operand 2:   %vreg7
Expected a GR64_NOSP register, but got a GR64 register

http://reviews.llvm.org/D6262

Files:
  lib/Target/X86/X86FastISel.cpp
  test/CodeGen/X86/fast-isel-regclass.ll
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