[clang] [clang][bytecode] Fix assertion in Pointer::isInitialized() for GlobalInlineDescriptor (PR #175512)

[Shafik Yaghmour via cfe-commits]

================
@@ -448,8 +448,7 @@ bool Pointer::isInitialized() const {
   if (!isBlockPointer())
     return true;
 
-  if (isRoot() && BS.Base == sizeof(GlobalInlineDescriptor) &&
-      Offset == BS.Base) {
----------------
shafik wrote:

The summary describes why `isRoot()` is too restrictive but I don't see why `Offset == BS.Base` is as well? 

https://github.com/llvm/llvm-project/pull/175512