[X86] FixupLEAs, reduce number of calls to getOperand and use X86::AddrBaseReg/AddrIndexReg, etc. instead of hardcoded constants.
[X86] FixupLEAs, reduce number of calls to getOperand and use X86::AddrBaseReg/AddrIndexReg, etc. instead of hardcoded constants.

Makes the code a little more readable.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@349983 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm