6761594: framesize rounding code rounds using wrong units leading to slightly oversized frames

Reviewed-by: rasbold, kvn

src/share/vm/opto/chaitin.cpp

@@ -440,9 +440,7 @@ void PhaseChaitin::Register_Allocate() {
   assert((int)(_matcher._new_SP+_framesize) >= (int)_matcher._out_arg_limit, "framesize must be large enough");
 
   // This frame must preserve the required fp alignment
-  const int stack_alignment_in_words = Matcher::stack_alignment_in_slots();
-  if (stack_alignment_in_words > 0)
-    _framesize = round_to(_framesize, Matcher::stack_alignment_in_bytes());
+  _framesize = round_to(_framesize, Matcher::stack_alignment_in_slots());
   assert( _framesize >= 0 && _framesize <= 1000000, "sanity check" );
 #ifndef PRODUCT
   _total_framesize += _framesize;