[llvm] [BOLT] Fix runOnEachFunctionWithUniqueAllocId (PR #90039)

[Maksim Panchenko via llvm-commits]

================
@@ -164,6 +164,15 @@ void runOnEachFunction(BinaryContext &BC, SchedulingPolicy SchedPolicy,
   Pool.wait();
 }
 
+static void EnsureAllocatorExists(BinaryContext &BC, unsigned AllocId) {
+  if (!BC.MIB->checkAllocatorExists(AllocId)) {
+    MCPlusBuilder::AllocatorIdTy Id =
+        BC.MIB->initializeNewAnnotationAllocator();
+    (void)Id;
+    assert(AllocId == Id && "unexpected allocator id created");
----------------
maksfb wrote:

nit:
```suggestion
    assert(AllocId == Id && "Unexpected allocator id created");
```

https://github.com/llvm/llvm-project/pull/90039