[llvm] [RFC][RISCV] Support the large code model. (PR #70308)

[Shao-Ce SUN via llvm-commits]

================
@@ -17489,22 +17539,34 @@ SDValue RISCVTargetLowering::LowerCall(CallLoweringInfo &CLI,
   // If the callee is a GlobalAddress/ExternalSymbol node, turn it into a
   // TargetGlobalAddress/TargetExternalSymbol node so that legalize won't
   // split it and then direct call can be matched by PseudoCALL.
-  if (GlobalAddressSDNode *S = dyn_cast<GlobalAddressSDNode>(Callee)) {
-    const GlobalValue *GV = S->getGlobal();
+  if (getTargetMachine().getCodeModel() == CodeModel::Large) {
+    if (GlobalAddressSDNode *S = dyn_cast<GlobalAddressSDNode>(Callee)) {
+      Callee =
+          getLargeGlobalAddress(S, DL, getPointerTy(DAG.getDataLayout()), DAG);
----------------
sunshaoce wrote:

`getPointerTy(DAG.getDataLayout())` can be replaced by `PtrVT`

https://github.com/llvm/llvm-project/pull/70308