AMDGPU/GlobalISel/Emitter Recognize additional 'same operand checks'

The "name" of a non-leaf complex pattern (MY_PAT $op1, $op2) is
"MY_PAT:op1:op2" and the ones with same "name" represent same operand.
Add 'same operand check' for this case.

Differential Revision: https://reviews.llvm.org/D87351