Revert "Prevent IR-gen from emitting consteval declarations"

This reverts commit 3bab88b7baa20b276faaee0aa7ca87f636c91877.

This patch causes test failures:
http://lab.llvm.org:8011/builders/clang-cmake-armv7-quick/builds/17260

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 870bf769..c8f1a92 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -9986,6 +9986,8 @@ public:
   //                            Visitor Methods
   //===--------------------------------------------------------------------===//
 
+  bool VisitConstantExpr(const ConstantExpr *E);
+
   bool VisitIntegerLiteral(const IntegerLiteral *E) {
     return Success(E->getValue(), E);
   }
@@ -10767,6 +10769,13 @@ static bool tryEvaluateBuiltinObjectSize(const Expr *E, unsigned Type,
   return true;
 }
 
+bool IntExprEvaluator::VisitConstantExpr(const ConstantExpr *E) {
+  llvm::SaveAndRestore<bool> InConstantContext(Info.InConstantContext, true);
+  if (E->getResultAPValueKind() != APValue::None)
+    return Success(E->getAPValueResult(), E);
+  return ExprEvaluatorBaseTy::VisitConstantExpr(E);
+}
+
 bool IntExprEvaluator::VisitCallExpr(const CallExpr *E) {
   if (unsigned BuiltinOp = E->getBuiltinCallee())
     return VisitBuiltinCallExpr(E, BuiltinOp);