8133951: Zero interpreter asserts in stubRoutines.cpp

Summary: Allow zero sized code buffer when checking if there's enough remaining size
Reviewed-by: kvn

src/share/vm/runtime/stubRoutines.cpp

@@ -176,7 +176,7 @@ void StubRoutines::initialize1() {
     StubGenerator_generate(&buffer, false);
     // When new stubs added we need to make sure there is some space left
     // to catch situation when we should increase size again.
-    assert(buffer.insts_remaining() > 200, "increase code_size1");
+    assert(code_size1 == 0 || buffer.insts_remaining() > 200, "increase code_size1");
   }
 }
 
@@ -231,7 +231,7 @@ void StubRoutines::initialize2() {
     StubGenerator_generate(&buffer, true);
     // When new stubs added we need to make sure there is some space left
     // to catch situation when we should increase size again.
-    assert(buffer.insts_remaining() > 200, "increase code_size2");
+    assert(code_size2 == 0 || buffer.insts_remaining() > 200, "increase code_size2");
   }
 
 #ifdef ASSERT