PGO: Make branch-weights regression test more robust.

src/test/run-make-fulldeps/pgo-branch-weights/filecheck-patterns.txt

@@ -2,23 +2,23 @@
 # First, establish that certain !prof labels are attached to the expected
 # functions and branching instructions.
 
-CHECK: define void @function_called_twice(i32 %c) {{.*}} !prof !29 {
-CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !prof !30
+CHECK: define void @function_called_twice(i32 %c) {{.*}} !prof [[function_called_twice_id:![0-9]+]] {
+CHECK: br i1 {{.*}}, label {{.*}}, label {{.*}}, !prof [[branch_weights0:![0-9]+]]
 
-CHECK: define void @function_called_42_times(i32 %c) {{.*}} !prof !31 {
+CHECK: define void @function_called_42_times(i32 %c) {{.*}} !prof [[function_called_42_times_id:![0-9]+]] {
 CHECK:      switch i32 %c, label {{.*}} [
 CHECK-NEXT:     i32 97, label {{.*}}
 CHECK-NEXT:     i32 98, label {{.*}}
-CHECK-NEXT: ], !prof !32
+CHECK-NEXT: ], !prof [[branch_weights1:![0-9]+]]
 
-CHECK: define void @function_called_never(i32 {{.*}} !prof !33 {
+CHECK: define void @function_called_never(i32 {{.*}} !prof [[function_called_never_id:![0-9]+]] {
 
 
 
 # Now check that those !prof tags hold the expected counts
 
-CHECK: !29 = !{!"function_entry_count", i64 2}
-CHECK: !30 = !{!"branch_weights", i32 2, i32 0}
-CHECK: !31 = !{!"function_entry_count", i64 42}
-CHECK: !32 = !{!"branch_weights", i32 2, i32 12, i32 28}
-CHECK: !33 = !{!"function_entry_count", i64 0}
+CHECK: [[function_called_twice_id]] = !{!"function_entry_count", i64 2}
+CHECK: [[branch_weights0]] = !{!"branch_weights", i32 2, i32 0}
+CHECK: [[function_called_42_times_id]] = !{!"function_entry_count", i64 42}
+CHECK: [[branch_weights1]] = !{!"branch_weights", i32 2, i32 12, i32 28}
+CHECK: [[function_called_never_id]] = !{!"function_entry_count", i64 0}