[flang][debug] Correct pointer size. (#120781)

We were passing size in bytes for the sizeInBits field in
DIDerivedTypeAttr with DW_TAG_pointer_type. Although this field is
un-used in this case but better to be accurate.

Author: abidh

flang/lib/Optimizer/Transforms/DebugTypeGenerator.cpp

@@ -638,7 +638,7 @@ mlir::LLVM::DITypeAttr DebugTypeGenerator::convertPointerLikeType(
 
   return mlir::LLVM::DIDerivedTypeAttr::get(
       context, llvm::dwarf::DW_TAG_pointer_type,
-      mlir::StringAttr::get(context, ""), elTyAttr, ptrSize,
+      mlir::StringAttr::get(context, ""), elTyAttr, /*sizeInBits=*/ptrSize * 8,
       /*alignInBits=*/0, /*offset=*/0,
       /*optional<address space>=*/std::nullopt, /*extra data=*/nullptr);
 }