Generalize codegen tests to not hardcode G_MIR opcodes (llvm#162554)

(trivial change, no review expected)

Author: nhaehnle

llvm/test/CodeGen/AArch64/GlobalISel/legalizer-info-validation.mir

@@ -70,12 +70,12 @@
 # DEBUG-NEXT: .. the first uncovered type index: 1, OK
 # DEBUG-NEXT: .. the first uncovered imm index: 0, OK
 #
-# DEBUG-NEXT: G_ABDS (opcode 65): 1 type index, 0 imm indices
+# DEBUG-NEXT: G_ABDS (opcode [[G_ABDS:[0-9]+]]): 1 type index, 0 imm indices
 # DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 #
-# DEBUG-NEXT: G_ABDU (opcode 66): 1 type index, 0 imm indices
-# DEBUG-NEXT: .. opcode {{[0-9]+}} is aliased to {{[0-9]+}}
+# DEBUG-NEXT: G_ABDU (opcode [[G_ABDU:[0-9]+]]): 1 type index, 0 imm indices
+# DEBUG-NEXT: .. opcode [[G_ABDU]] is aliased to [[G_ABDS]]
 # DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 #

llvm/test/CodeGen/RISCV/GlobalISel/legalizer-info-validation.mir

@@ -72,12 +72,12 @@
 # DEBUG-NEXT: .. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: user-defined predicate detected
 #
-# DEBUG-NEXT: G_ABDS (opcode 65): 1 type index, 0 imm indices
+# DEBUG-NEXT: G_ABDS (opcode [[G_ABDS:[0-9]+]]): 1 type index, 0 imm indices
 # DEBUG-NEXT:.. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT:.. imm index coverage check SKIPPED: user-defined predicate detected
 #
-# DEBUG-NEXT:G_ABDU (opcode 66): 1 type index, 0 imm indices
-# DEBUG-NEXT:.. opcode 66 is aliased to 65
+# DEBUG-NEXT:G_ABDU (opcode [[G_ABDU:[0-9]+]]): 1 type index, 0 imm indices
+# DEBUG-NEXT:.. opcode [[G_ABDU]] is aliased to [[G_ABDS]]
 # DEBUG-NEXT:.. type index coverage check SKIPPED: user-defined predicate detected
 # DEBUG-NEXT:.. imm index coverage check SKIPPED: user-defined predicate detected
 #