[TableGen,X86] Remove extra optional operand from RawFrm. RawFrm with 2 immediates is handled by RawFrmImm8/RawFrmImm16.
[TableGen,X86] Remove extra optional operand from RawFrm. RawFrm with 2 immediates is handled by RawFrmImm8/RawFrmImm16.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@261187 91177308-0d34-0410-b5e6-96231b3b80d8

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