8054530: C2: assert(res == old_res) failed: Inconsistency between old and new

Summary: Fixed signedness problem with assertion.
Reviewed-by: kvn

src/share/vm/oops/objArrayOop.hpp

@@ -45,9 +45,10 @@ class objArrayOopDesc : public arrayOopDesc {
 private:
   // Give size of objArrayOop in HeapWords minus the header
   static int array_size(int length) {
-    const int OopsPerHeapWord = HeapWordSize/heapOopSize;
+    const uint OopsPerHeapWord = HeapWordSize/heapOopSize;
     assert(OopsPerHeapWord >= 1 && (HeapWordSize % heapOopSize == 0),
            "Else the following (new) computation would be in error");
+    uint res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;
 #ifdef ASSERT
     // The old code is left in for sanity-checking; it'll
     // go away pretty soon. XXX
@@ -55,16 +56,15 @@ private:
     // oop->length() * HeapWordsPerOop;
     // With narrowOops, HeapWordsPerOop is 1/2 or equal 0 as an integer.
     // The oop elements are aligned up to wordSize
-    const int HeapWordsPerOop = heapOopSize/HeapWordSize;
-    int old_res;
+    const uint HeapWordsPerOop = heapOopSize/HeapWordSize;
+    uint old_res;
     if (HeapWordsPerOop > 0) {
       old_res = length * HeapWordsPerOop;
     } else {
-      old_res = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord;
+      old_res = align_size_up((uint)length, OopsPerHeapWord)/OopsPerHeapWord;
     }
-#endif  // ASSERT
-    int res = ((uint)length + OopsPerHeapWord - 1)/OopsPerHeapWord;
     assert(res == old_res, "Inconsistency between old and new.");
+#endif  // ASSERT
     return res;
   }