6695506: JVM should accept classfiles with classfile version 51

Summary: increase class file parser's acceptable max to 51
Reviewed-by: sbohne, ikrylov

hotspot/src/share/vm/classfile/classFileParser.cpp

@@ -34,7 +34,7 @@
 
 #define JAVA_CLASSFILE_MAGIC              0xCAFEBABE
 #define JAVA_MIN_SUPPORTED_VERSION        45
-#define JAVA_MAX_SUPPORTED_VERSION        50
+#define JAVA_MAX_SUPPORTED_VERSION        51
 #define JAVA_MAX_SUPPORTED_MINOR_VERSION  0
 
 // Used for two backward compatibility reasons: