Fix Issue #877 - Use GT_OBJ when copying a struct (#40483)

diff --git a/src/coreclr/src/jit/morph.cpp b/src/coreclr/src/jit/morph.cpp
index 61ad993..8134272 100644 (file)
--- a/src/coreclr/src/jit/morph.cpp
+++ b/src/coreclr/src/jit/morph.cpp
@@ -5742,7 +5742,9 @@ GenTree* Compiler::fgMorphStackArgForVarArgs(unsigned lclNum, var_types varType,
         GenTree* tree;
         if (varTypeIsStruct(varType))
         {
-            tree = new (this, GT_BLK) GenTreeBlk(GT_BLK, TYP_STRUCT, ptrArg, typGetBlkLayout(varDsc->lvExactSize));
+            CORINFO_CLASS_HANDLE typeHnd = varDsc->lvVerTypeInfo.GetClassHandle();
+            assert(typeHnd != nullptr);
+            tree = gtNewObjNode(typeHnd, ptrArg);
         }
         else
         {