[X86] Silence GCC enum compare warning.
[X86] Silence GCC enum compare warning.

X86ISelLowering.cpp:26506:36: error: enumeral mismatch in conditional
expression: 'llvm::X86ISD::NodeType' vs 'llvm::ISD::NodeType'
[-Werror=enum-compare]

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@296986 91177308-0d34-0410-b5e6-96231b3b80d8

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