[Clang] Add TimeTraceScope to Sema::CheckConstraintSatisfaction (#170264)

Evaluating concepts can take quite a bit of time and it's not
necessarily obvious what's part of that and what not. This scope makes
it clear which parts are concept evaluation and where they are invoked.

Author: philnik777

clang/lib/Sema/SemaConcept.cpp

@@ -30,6 +30,7 @@
 #include "llvm/ADT/PointerUnion.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/SaveAndRestore.h"
+#include "llvm/Support/TimeProfiler.h"
 
 using namespace clang;
 using namespace sema;
@@ -1182,6 +1183,10 @@ bool Sema::CheckConstraintSatisfaction(
     const MultiLevelTemplateArgumentList &TemplateArgsLists,
     SourceRange TemplateIDRange, ConstraintSatisfaction &OutSatisfaction,
     const ConceptReference *TopLevelConceptId, Expr **ConvertedExpr) {
+  llvm::TimeTraceScope TimeScope(
+      "CheckConstraintSatisfaction", [TemplateIDRange, this] {
+        return TemplateIDRange.printToString(getSourceManager());
+      });
   if (AssociatedConstraints.empty()) {
     OutSatisfaction.IsSatisfied = true;
     return false;

clang/unittests/Support/TimeProfilerTest.cpp

@@ -272,11 +272,14 @@ TEST(TimeProfilerTest, ClassTemplateInstantiations) {
   ASSERT_EQ(R"(
 Frontend (test.cc)
 | ParseClass (S)
+| CheckConstraintSatisfaction (<test.cc:9:21, col:29>)
 | InstantiateClass (S<double>, test.cc:9)
 | InstantiateFunction (S<double>::foo, test.cc:5)
 | ParseDeclarationOrFunctionDefinition (test.cc:11:5)
 | | ParseFunctionDefinition (user)
+| | | CheckConstraintSatisfaction (<test.cc:12:7, col:12>)
 | | | InstantiateClass (S<int>, test.cc:3)
+| | | CheckConstraintSatisfaction (<test.cc:13:7, col:14>)
 | | | InstantiateClass (S<float>, test.cc:3)
 | | | DeferInstantiation (S<float>::foo)
 | PerformPendingInstantiations