8047130: Fewer escapes from escape analysis

Summary: Treat max_stack attribute as an int in bytecode escape analyzer
Reviewed-by: kvn, twisti, ahgross

src/share/vm/ci/bcEscapeAnalyzer.cpp

@@ -89,8 +89,8 @@ class BCEscapeAnalyzer::StateInfo {
 public:
   ArgumentMap *_vars;
   ArgumentMap *_stack;
-  short _stack_height;
-  short _max_stack;
+  int _stack_height;
+  int _max_stack;
   bool _initialized;
   ArgumentMap empty_map;