[Misc] Make EnableJFR obsolete

Summary: make EnableJFR obsolete

Test Plan: java -XX:+/-EnableJFR -version

Reviewed-by: zhengxiaolinX

Issue: https://github.com/alibaba/dragonwell8/issues/119

src/share/vm/runtime/arguments.cpp

@@ -323,6 +323,7 @@ static ObsoleteFlag obsolete_jvm_flags[] = {
   { "AutoShutdownNMT",               JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) },
   { "CompilationRepeat",             JDK_Version::jdk(8), JDK_Version::jdk(9) },
   { "SegmentedHeapDumpThreshold",    JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) },
+  { "EnableJFR",                     JDK_Version::jdk_update(8, 262), JDK_Version::jdk(9) },
 #ifdef PRODUCT
   { "DesiredMethodLimit",
                            JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) },

src/share/vm/runtime/java.hpp

@@ -138,7 +138,7 @@ class JDK_Version VALUE_OBJ_CLASS_SPEC {
     return JDK_Version(m);
   }
 
-  static JDK_Version jdk_update(uint8_t major, uint8_t update_number) {
+  static JDK_Version jdk_update(uint8_t major, uint16_t update_number) {
     return JDK_Version(major, 0, 0, update_number);
   }