Fix the issue

Author: EgorBo

src/coreclr/jit/valuenum.cpp

@@ -2708,9 +2708,9 @@ ValueNum ValueNumStore::VNForCast(VNFunc func, ValueNum castToVN, ValueNum objVN
         bool                 isExact;
         bool                 isNonNull;
         CORINFO_CLASS_HANDLE castFrom = GetObjectType(objVN, &isExact, &isNonNull);
-        CORINFO_CLASS_HANDLE castTo;
+        CORINFO_CLASS_HANDLE castTo   = NO_CLASS_HANDLE;
         if ((castFrom != NO_CLASS_HANDLE) &&
-            EmbeddedHandleMapLookup(ConstantValue<ssize_t>(castToVN), (ssize_t*)&castTo))
+            EmbeddedHandleMapLookup(ConstantValue<ssize_t>(castToVN), (ssize_t*)&castTo) && (castTo != NO_CLASS_HANDLE))
         {
             TypeCompareState castResult = m_pComp->info.compCompHnd->compareTypesForCast(castFrom, castTo);
             if (castResult == TypeCompareState::Must)
@@ -13738,9 +13738,12 @@ bool Compiler::fgValueNumberSpecialIntrinsic(GenTreeCall* call)
                 break;
             }
 
-            ValueNum clsVN = typeHandleFuncApp.m_args[0];
-            ssize_t  clsHandle;
-            if (!vnStore->EmbeddedHandleMapLookup(vnStore->ConstantValue<ssize_t>(clsVN), &clsHandle))
+            ValueNum clsVN     = typeHandleFuncApp.m_args[0];
+            ssize_t  clsHandle = 0;
+
+            // NOTE: EmbeddedHandleMapLookup may return 0 for non-0 embedded handle
+            if (!vnStore->EmbeddedHandleMapLookup(vnStore->ConstantValue<ssize_t>(clsVN), &clsHandle) &&
+                (clsHandle != 0))
             {
                 break;
             }
@@ -15152,9 +15155,12 @@ CORINFO_CLASS_HANDLE ValueNumStore::GetObjectType(ValueNum vn, bool* pIsExact, b
     const VNFunc func = funcApp.m_func;
     if ((func == VNF_CastClass) || (func == VNF_IsInstanceOf) || (func == VNF_JitNew))
     {
-        ssize_t  clsHandle;
-        ValueNum clsVN = funcApp.m_args[0];
-        if (IsVNTypeHandle(clsVN) && EmbeddedHandleMapLookup(ConstantValue<ssize_t>(clsVN), &clsHandle))
+        ssize_t  clsHandle = 0;
+        ValueNum clsVN     = funcApp.m_args[0];
+
+        // NOTE: EmbeddedHandleMapLookup may return 0 for non-0 embedded handle
+        if (IsVNTypeHandle(clsVN) && EmbeddedHandleMapLookup(ConstantValue<ssize_t>(clsVN), &clsHandle) &&
+            (clsHandle != 0))
         {
             // JitNew returns an exact and non-null obj, castclass and isinst do not have this guarantee.
             *pIsNonNull = func == VNF_JitNew;