[CallSite removal][WebAssembly] Replace CallSite with CallBase in WebAssemblyOptimizeReturned.

[dblaikie]

Looks good!

llvm/lib/Target/WebAssembly/WebAssemblyOptimizeReturned.cpp

 //===-- WebAssemblyOptimizeReturned.cpp - Optimize "returned" attributes --===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 ///
class OptimizeReturned final : public FunctionPass,
   bool runOnFunction(Function &F) override;
 
   DominatorTree *DT = nullptr;
 
 public:
   static char ID;
   OptimizeReturned() : FunctionPass(ID) {}
 
-  void visitCallSite(CallSite CS);
+  void visitCallBase(CallBase &CB);
 };
 } // End anonymous namespace
 
 char OptimizeReturned::ID = 0;
 INITIALIZE_PASS(OptimizeReturned, DEBUG_TYPE,
                 "Optimize calls with \"returned\" attributes for WebAssembly",
                 false, false)
 
 FunctionPass *llvm::createWebAssemblyOptimizeReturned() {
   return new OptimizeReturned();
 }
 
-void OptimizeReturned::visitCallSite(CallSite CS) {
-  for (unsigned I = 0, E = CS.getNumArgOperands(); I < E; ++I)
-    if (CS.paramHasAttr(I, Attribute::Returned)) {
-      Instruction *Inst = CS.getInstruction();
-      Value *Arg = CS.getArgOperand(I);
+void OptimizeReturned::visitCallBase(CallBase &CB) {
+  for (unsigned I = 0, E = CB.getNumArgOperands(); I < E; ++I)
+    if (CB.paramHasAttr(I, Attribute::Returned)) {
+      Value *Arg = CB.getArgOperand(I);
       // Ignore constants, globals, undef, etc.
       if (isa<Constant>(Arg))
         continue;
       // Like replaceDominatedUsesWith but using Instruction/Use dominance.
-      Arg->replaceUsesWithIf(Inst,
-                             [&](Use &U) { return DT->dominates(Inst, U); });
+      Arg->replaceUsesWithIf(&CB,
+                             [&](Use &U) { return DT->dominates(&CB, U); });
     }
 }
 
 bool OptimizeReturned::runOnFunction(Function &F) {
   LLVM_DEBUG(dbgs() << "********** Optimize returned Attributes **********\n"
                        "********** Function: "
                     << F.getName() << '\n');
 
   DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
   visit(F);
   return true;
 }