[TableGen][GlobalISel] Make the arguments of the Instruction and Operand Matchers consistent
[TableGen][GlobalISel] Make the arguments of the Instruction and Operand Matchers consistent

Move InsnVarID and OpIdx at the beginning of the list of arguments
for all the constructors of the OperandMatcher subclasses.
This matches what we do for the InstructionMatcher.

NFC.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@321031 91177308-0d34-0410-b5e6-96231b3b80d8

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