[clang][Interp] Don't try to activate root pointers

No inline descriptor means we can't do that.

Author: tbaederr

clang/lib/AST/Interp/Interp.h

@@ -1335,17 +1335,19 @@ inline bool GetPtrThisBase(InterpState &S, CodePtr OpPC, uint32_t Off) {
 
 inline bool FinishInitPop(InterpState &S, CodePtr OpPC) {
   const Pointer &Ptr = S.Stk.pop<Pointer>();
-  if (Ptr.canBeInitialized())
+  if (Ptr.canBeInitialized()) {
     Ptr.initialize();
-  Ptr.activate();
+    Ptr.activate();
+  }
   return true;
 }
 
 inline bool FinishInit(InterpState &S, CodePtr OpPC) {
   const Pointer &Ptr = S.Stk.peek<Pointer>();
-  if (Ptr.canBeInitialized())
+  if (Ptr.canBeInitialized()) {
     Ptr.initialize();
-  Ptr.activate();
+    Ptr.activate();
+  }
   return true;
 }
 

clang/test/AST/Interp/cxx98.cpp

@@ -50,3 +50,7 @@ _Static_assert(c0_test == 0, "");
 int a = 0; // both-note {{declared here}}
 _Static_assert(a == 0, ""); // both-error {{static assertion expression is not an integral constant expression}} \
                             // both-note {{read of non-const variable 'a' is not allowed in a constant expression}}
+
+struct SelfReference { SelfReference &r; };
+extern SelfReference self_reference_1;
+SelfReference self_reference_2 = {self_reference_1};