[CallSite removal] Refactoring llvm::InlineFunction APIs

[mtrofin]

Summary

This change only unifies the API previous API pair accepting
CallInst and InvokeInst, thus making it easier to refactor
inliner pass ode to CallBase. The implementation of the unified
API still relies on the CallSite implementation.

[mtrofin]

Gentle reminder - thanks!

[jdoerfert]

LGTM

llvm/include/llvm/Transforms/Utils/Cloning.h

 /// *inlined* code to minimize the actual inserted code, it must not delete
 /// code in the caller as users of this routine may have pointers to
 /// instructions in the caller that need to remain stable.
 ///
 /// If ForwardVarArgsTo is passed, inlining a function with varargs is allowed
 /// and all varargs at the callsite will be passed to any calls to
 /// ForwardVarArgsTo. The caller of InlineFunction has to make sure any varargs
 /// are only used by ForwardVarArgsTo.
-InlineResult InlineFunction(CallInst *C, InlineFunctionInfo &IFI,
-                            AAResults *CalleeAAR = nullptr,
-                            bool InsertLifetime = true);
-InlineResult InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI,
+InlineResult InlineFunction(CallBase *CB, InlineFunctionInfo &IFI,
                             AAResults *CalleeAAR = nullptr,
                             bool InsertLifetime = true);
 InlineResult InlineFunction(CallSite CS, InlineFunctionInfo &IFI,
                             AAResults *CalleeAAR = nullptr,
                             bool InsertLifetime = true,
                             Function *ForwardVarArgsTo = nullptr);
 
 /// Clones a loop \p OrigLoop.  Returns the loop and the blocks in \p

llvm/lib/Transforms/Utils/InlineFunction.cpp

EnableNoAliasConversion("enable-noalias-to-md-conversion", cl::init(true),
   cl::Hidden,
   cl::desc("Convert noalias attributes to metadata during inlining."));
 
 static cl::opt<bool>
 PreserveAlignmentAssumptions("preserve-alignment-assumptions-during-inlining",
   cl::init(true), cl::Hidden,
   cl::desc("Convert align attributes to assumptions during inlining."));
 
-llvm::InlineResult llvm::InlineFunction(CallInst *CI, InlineFunctionInfo &IFI,
+llvm::InlineResult llvm::InlineFunction(CallBase *CB, InlineFunctionInfo &IFI,
                                         AAResults *CalleeAAR,
                                         bool InsertLifetime) {
-  return InlineFunction(CallSite(CI), IFI, CalleeAAR, InsertLifetime);
-}
-
-llvm::InlineResult llvm::InlineFunction(InvokeInst *II, InlineFunctionInfo &IFI,
-                                        AAResults *CalleeAAR,
-                                        bool InsertLifetime) {
-  return InlineFunction(CallSite(II), IFI, CalleeAAR, InsertLifetime);
+  return InlineFunction(CallSite(CB), IFI, CalleeAAR, InsertLifetime);
 }
 
 namespace {
 
   /// A class for recording information about inlining a landing pad.
   class LandingPadInliningInfo {
     /// Destination of the invoke's unwind.
     BasicBlock *OuterResumeDest;