[llvm] [PowerPC] using milicode call for strcpy instead of lib call (PR #174782)

[Matt Arsenault via llvm-commits]

================
@@ -9166,6 +9166,32 @@ SelectionDAG::getMemcmp(SDValue Chain, const SDLoc &dl, SDValue Mem0,
   return TLI->LowerCallTo(CLI);
 }
 
+std::pair<SDValue, SDValue> SelectionDAG::getStrcpy(SDValue Chain,
+                                                    const SDLoc &dl,
+                                                    SDValue Dst, SDValue Src,
+                                                    const CallInst *CI) {
+  const char *LibCallName = TLI->getLibcallName(RTLIB::STRCPY);
+  if (!LibCallName)
+    return {};
+
+  PointerType *PT = PointerType::getUnqual(*getContext());
+  TargetLowering::ArgListTy Args = {{Dst, PT}, {Src, PT}};
+
+  TargetLowering::CallLoweringInfo CLI(*this);
+  bool IsTailCall =
+      isInTailCallPositionWrapper(CI, this, /*AllowReturnsFirstArg*/ true);
----------------
arsenm wrote:

```suggestion
      isInTailCallPositionWrapper(CI, this, /*AllowReturnsFirstArg=*/ true);
```

https://github.com/llvm/llvm-project/pull/174782