[llvm] [UTC] Support to test annotated IR (PR #165419)

[Kunqiu Chen via llvm-commits]

================
@@ -98,11 +98,16 @@ define void @test3(i32 %x, i32 %y) {
 ; CHECK-NEXT:    [[XZ:%.*]] = icmp eq i32 [[X:%.*]], 0
 ; CHECK-NEXT:    [[YZ:%.*]] = icmp eq i32 [[Y:%.*]], 0
 ; CHECK-NEXT:    [[Z:%.*]] = and i1 [[XZ]], [[YZ]]
-; CHECK:         [[Z_0:%.*]] = bitcast i1 [[Z]] to i1
-; CHECK:         [[XZ_0:%.*]] = bitcast i1 [[XZ]] to i1
-; CHECK:         [[X_0:%.*]] = bitcast i32 [[X]] to i32
-; CHECK:         [[YZ_0:%.*]] = bitcast i1 [[YZ]] to i1
-; CHECK:         [[Y_0:%.*]] = bitcast i32 [[Y]] to i32
+; CHECK-NEXT:  ; branch predicate info { TrueEdge: 0 Comparison: [[Z]] = and i1 [[XZ]], [[YZ]] Edge: [label [[TMP0:%.*]],label %nope], RenamedOp: [[Z]] }
----------------
Camsyn wrote:

https://github.com/llvm/llvm-project/commit/597ac471cc7da97ccf957362a7e9f7a52d6910ee introduced such var regex suffix to help locate a var.

I think it should be safe to add '\]' as another suffix, since `phi i32 [%a, %then], [%b, %else]` without space is also a legal LLVM IR.

https://github.com/llvm/llvm-project/pull/165419