Revert "[RISCV] Properly support RISCVISD::LLA in getTargetConstantFromLoad. (#145112)"

I missed the Co-authored-by that I tried to add.

This reverts commit 1da864b.

Author: topperc

llvm/lib/Target/RISCV/RISCVISelLowering.cpp

@@ -21062,7 +21062,7 @@ RISCVTargetLowering::getTargetConstantFromLoad(LoadSDNode *Ld) const {
 
   // Simple case, LLA.
   if (Ptr.getOpcode() == RISCVISD::LLA) {
-    auto *CNode = GetSupportedConstantPool(Ptr.getOperand(0));
+    auto *CNode = GetSupportedConstantPool(Ptr);
     if (!CNode || CNode->getTargetFlags() != 0)
       return nullptr;