JIT: Handle byref<->nint casts on addresses in local morph (#117885)

Author: jakobbotsch

src/coreclr/jit/importer.cpp

@@ -13395,7 +13395,7 @@ void Compiler::impInlineRecordArgInfo(InlineInfo*   pInlineInfo,
 //   The method may make observations that lead to marking this candidate as
 //   a failed inline. If this happens the initialization is abandoned immediately
 //   to try and reduce the jit time cost for a failed inline.
-
+//
 void Compiler::impInlineInitVars(InlineInfo* pInlineInfo)
 {
     assert(!compIsForInlining());

src/coreclr/jit/lclmorph.cpp

@@ -1240,6 +1240,19 @@ class LocalAddressVisitor final : public GenTreeVisitor<LocalAddressVisitor>
                 PopValue();
                 break;
 
+            case GT_CAST:
+                assert(TopValue(1).Node() == node);
+                assert(TopValue(0).Node() == node->AsCast()->CastOp());
+
+                if (!node->TypeIs(TYP_I_IMPL, TYP_BYREF) || node->gtOverflow() || !TopValue(0).IsAddress() ||
+                    !TopValue(1).AddOffset(TopValue(0), 0))
+                {
+                    EscapeValue(TopValue(0), node);
+                }
+
+                PopValue();
+                break;
+
             case GT_CALL:
                 while (TopValue(0).Node() != node)
                 {