[globalisel][tablegen] Correct matching of intrinsic ID's.

TreePatternNode considers them to be plain integers but MachineInstr considers
them to be a distinct kind of operand.

The tweak to AArch64InstrInfo.td to produce a simple test case is a NFC for
everything except GlobalISelEmitter (confirmed by diffing the tablegenerated
files). GlobalISelEmitter is currently unable to infer the type of operands in
the Dst pattern from the operands in the Src pattern.

llvm-svn: 307634