Replace hard coded opcodes from #93841 with regexes to be more flexible. (#96277)

This change removes the hard coded opcode values and replaces them with
regexes so that the test can deal with different opcode numbers being
assigned and unbreak a ton of bots.

Author: dyung

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

@@ -822,10 +822,10 @@
 # DEBUG-NEXT: .. opcode {{[0-9]+}} is aliased to {{[0-9]+}}
 # 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_VECREDUCE_FMAXIMUMNUM (opcode 276): 2 type indices, 0 imm indices
+# DEBUG-NEXT: G_VECREDUCE_FMAXIMUMNUM (opcode {{[0-9]+}}): 2 type indices, 0 imm indices
 # DEBUG-NEXT: .. type index coverage check SKIPPED: no rules defined
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: no rules defined
-# DEBUG-NEXT: G_VECREDUCE_FMINIMUMNUM (opcode 277): 2 type indices, 0 imm indices
+# DEBUG-NEXT: G_VECREDUCE_FMINIMUMNUM (opcode {{[0-9]+}}): 2 type indices, 0 imm indices
 # DEBUG-NEXT: .. type index coverage check SKIPPED: no rules defined
 # DEBUG-NEXT: .. imm index coverage check SKIPPED: no rules defined
 # DEBUG-NEXT: G_VECREDUCE_ADD (opcode {{[0-9]+}}): 2 type indices, 0 imm indices