[clang][Interp][NFC] Handle body-less functions like implicit ones

They don't have any source to look up locations in.

Author: tbaederr

clang/lib/AST/Interp/InterpFrame.cpp

@@ -228,7 +228,7 @@ Pointer InterpFrame::getParamPointer(unsigned Off) {
 SourceInfo InterpFrame::getSource(CodePtr PC) const {
   // Implicitly created functions don't have any code we could point at,
   // so return the call site.
-  if (Func && Func->getDecl()->isImplicit() && Caller)
+  if (Func && (!Func->hasBody() || Func->getDecl()->isImplicit()) && Caller)
     return Caller->getSource(RetPC);
 
   return S.getSource(Func, PC);
@@ -243,7 +243,7 @@ SourceLocation InterpFrame::getLocation(CodePtr PC) const {
 }
 
 SourceRange InterpFrame::getRange(CodePtr PC) const {
-  if (Func && Func->getDecl()->isImplicit() && Caller)
+  if (Func && (!Func->hasBody() || Func->getDecl()->isImplicit()) && Caller)
     return Caller->getRange(RetPC);
 
   return S.getRange(Func, PC);