[analyzer] Refine TimeTrace name for dispatchWorkItem (#128352)

Fixes
https://github.com/llvm/llvm-project/pull/125508#discussion_r1965038954

clang/lib/StaticAnalyzer/Core/CoreEngine.cpp

@@ -183,7 +183,7 @@ bool CoreEngine::ExecuteWorkList(const LocationContext *L, unsigned MaxSteps,
 
 static std::string timeTraceScopeName(const ProgramPoint &Loc) {
   if (llvm::timeTraceProfilerEnabled()) {
-    return llvm::formatv("Loc {0}",
+    return llvm::formatv("dispatchWorkItem {0}",
                          ProgramPoint::getProgramPointKindName(Loc.getKind()))
         .str();
   }

clang/test/Analysis/ftime-trace.cpp

@@ -23,7 +23,7 @@
 // The trace also contains durations of each step, but they are so short that they are not reliably present
 // in each run. However, they are also aggregated into Total *, for example:
 //
-// CHECK:          "name": "Total Loc PostStmt",
+// CHECK:          "name": "Total dispatchWorkItem PostStmt",
 // CHECK-NEXT:     "args": {
 // CHECK-NEXT:         "count": {{[0-9]+}},
 // CHECK-NEXT:         "avg ms": {{[0-9]+}}