[X86] Add TODO for getTargetConstantFromBasePtr to support non-zero o…

…ffsets.

As noted on #66991 - we sometimes share vector constant pool entries, referencing subvectors within them via pointer offsets

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -4639,6 +4639,7 @@ static ConstantPoolSDNode *getTargetConstantPoolFromBasePtr(SDValue Ptr) {
   return dyn_cast<ConstantPoolSDNode>(Ptr);
 }
 
+// TODO: Add support for non-zero offsets.
 static const Constant *getTargetConstantFromBasePtr(SDValue Ptr) {
   ConstantPoolSDNode *CNode = getTargetConstantPoolFromBasePtr(Ptr);
   if (!CNode || CNode->isMachineConstantPoolEntry() || CNode->getOffset() != 0)