Automerge: [CIR] Add support for ExpressionTraitExpr (#171634)

Add support for the ExpressionTraitExpr

Author: AmrDeveloper

clang/lib/CIR/CodeGen/CIRGenExprScalar.cpp

@@ -859,9 +859,7 @@ class ScalarExprEmitter : public StmtVisitor<ScalarExprEmitter, mlir::Value> {
     return {};
   }
   mlir::Value VisitExpressionTraitExpr(const ExpressionTraitExpr *e) {
-    cgf.cgm.errorNYI(e->getSourceRange(),
-                     "ScalarExprEmitter: expression trait");
-    return {};
+    return builder.getBool(e->getValue(), cgf.getLoc(e->getExprLoc()));
   }
   mlir::Value VisitCXXPseudoDestructorExpr(const CXXPseudoDestructorExpr *e) {
     cgf.cgm.errorNYI(e->getSourceRange(),

clang/test/CIR/CodeGen/cxx-traits.cpp

@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -Wno-unused-value -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck --input-file=%t.cir %s -check-prefix=CIR
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -Wno-unused-value -fclangir -emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --input-file=%t-cir.ll %s -check-prefix=LLVM
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-linux-gnu -Wno-unused-value -emit-llvm %s -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=OGCG
+
+void expression_trait_expr() {
+  bool a = __is_lvalue_expr(0);
+}
+
+// CIR: %[[A_ADDR:.*]] = cir.alloca !cir.bool, !cir.ptr<!cir.bool>, ["a", init]
+// CIR: %[[CONST_FALSE:.*]] = cir.const #false
+// CIR: cir.store {{.*}} %[[CONST_FALSE]], %[[A_ADDR]] : !cir.bool, !cir.ptr<!cir.bool>
+
+// LLVM: %[[A_ADDR:.*]] = alloca i8, i64 1, align 1
+// LLVM: store i8 0, ptr %[[A_ADDR]], align 1
+
+// OGCG: %[[A_ADDR:.*]] = alloca i8, align 1
+// OGCG: store i8 0, ptr %[[A_ADDR]], align 1