CodeGen: Don't crash when a lambda uses a local constexpr variable

The DeclRefExpr might be for a variable initialized by a constant
expression which hasn't been ODR used.
Emit the initializer for the variable instead of trying to capture the
variable itself.

This fixes PR22071.

llvm-svn: 225060

1 files changed, 10 insertions, 2 deletions

diff --git a/clang/test/CodeGenCXX/lambda-expressions.cpp b/clang/test/CodeGenCXX/lambda-expressions.cpp
index e35c6163d56..49b9efbdaba 100644
--- a/clang/test/CodeGenCXX/lambda-expressions.cpp
+++ b/clang/test/CodeGenCXX/lambda-expressions.cpp
@@ -91,9 +91,17 @@ void staticarrayref(){
   }();
 }
 
-// CHECK: define internal void @"_ZZ1hvEN3$_88__invokeEv"(%struct.A* noalias sret %agg.result) {{.*}} {
+// CHECK-LABEL: define internal i32* @"_ZZ11PR22071_funvENK3$_8clEv"
+// CHECK: ret i32* @PR22071_var
+int PR22071_var;
+int *PR22071_fun() {
+  constexpr int &y = PR22071_var;
+  return [&] { return &y; }();
+}
+
+// CHECK: define internal void @"_ZZ1hvEN3$_98__invokeEv"(%struct.A* noalias sret %agg.result) {{.*}} {
 // CHECK-NOT: =
-// CHECK: call void @"_ZZ1hvENK3$_8clEv"(%struct.A* sret %agg.result,
+// CHECK: call void @"_ZZ1hvENK3$_9clEv"(%struct.A* sret %agg.result,
 // CHECK-NEXT: ret void
 struct A { ~A(); };
 void h() {