[clang][Interp] Handle lvalue APValues in visitAPValueInitializer()

Author: tbaederr

clang/lib/AST/Interp/ByteCodeExprGen.cpp

@@ -3188,7 +3188,7 @@ bool ByteCodeExprGen<Emitter>::visitAPValueInitializer(const APValue &Val,
       const APValue &F = Val.getStructField(I);
       const Record::Field *RF = R->getField(I);
 
-      if (F.isInt()) {
+      if (F.isInt() || F.isLValue()) {
         PrimType T = classifyPrim(RF->Decl->getType());
         if (!this->visitAPValue(F, T, E))
           return false;

clang/test/CodeGenCXX/template-param-objects-linkage.cpp

@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++20 %s -emit-llvm -o - | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-linux-gnu -std=c++20 %s -emit-llvm -o - -fexperimental-new-constant-interpreter | FileCheck %s
 
 struct S { char buf[32]; };
 template<S s> constexpr const char* f() { return s.buf; }