Use LclFld when copy to/from promoted from/to an unpromoted struct/bl…

…ock.
dotnet · Mar 11, 2021 · 4159742 · 4159742
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commit 4159742
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diff --git a/src/coreclr/jit/compiler.h b/src/coreclr/jit/compiler.h
@@ -5835,6 +5835,8 @@ class Compiler
     GenTree* fgMorphSmpOpOptional(GenTreeOp* tree);
     GenTree* fgMorphConst(GenTree* tree);
 
+    bool fgMorphCanUseLclFldForCopy(unsigned lclNum1, unsigned lclNum2);
+
     GenTreeLclVar* fgMorphTryFoldObjAsLclVar(GenTreeObj* obj);
     GenTree* fgMorphCommutative(GenTreeOp* tree);