[clang-format] clang-format eats space in front of attributes for operator delete

llvm/llvm-project#27037

Sorry its taken so long to get to this issue! (got it before it hit its 6th birthday!)

```
void operator delete(void *foo)ATTRIB;
```

(void *foo) is incorrectly determined to be a C-Style Cast resulting in the space being removed after the ) and before the attrib, due to the detection of

```
delete (A* )a;
```

The following was previously unaffected

```
void operator new(void *foo) ATTRIB;
```

Fixes #27037

Reviewed By: curdeius, HazardyKnusperkeks

Differential Revision: https://reviews.llvm.org/D116920

Author: mydeveloperday

clang/lib/Format/TokenAnnotator.cpp

@@ -1893,6 +1893,13 @@ class AnnotatingParser {
         LeftOfParens = LeftOfParens->MatchingParen->Previous;
       }
 
+      // The Condition directly below this one will see the operator arguments
+      // as a (void *foo) cast.
+      //   void operator delete(void *foo) ATTRIB;
+      if (LeftOfParens->Tok.getIdentifierInfo() && LeftOfParens->Previous &&
+          LeftOfParens->Previous->is(tok::kw_operator))
+        return false;
+
       // If there is an identifier (or with a few exceptions a keyword) right
       // before the parentheses, this is unlikely to be a cast.
       if (LeftOfParens->Tok.getIdentifierInfo() &&

clang/unittests/Format/FormatTest.cpp

@@ -9459,6 +9459,11 @@ TEST_F(FormatTest, UnderstandsNewAndDelete) {
                "    new (aaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaa))\n"
                "        typename aaaaaaaaaaaaaaaaaaaaaaaa();");
   verifyFormat("delete[] h->p;");
+
+  verifyFormat("void operator delete(void *foo) ATTRIB;");
+  verifyFormat("void operator new(void *foo) ATTRIB;");
+  verifyFormat("void operator delete[](void *foo) ATTRIB;");
+  verifyFormat("void operator delete(void *ptr) noexcept;");
 }
 
 TEST_F(FormatTest, UnderstandsUsesOfStarAndAmp) {