8238590: Enable JFR by default during compilation in 8u

Summary: Set the configure enable-jfr flag to true by default.
Reviewed-by: andrew

common/autoconf/generated-configure.sh

@@ -1855,7 +1855,7 @@ Optional Features:
                           run the Queens test after Hotspot build [disabled]
   --enable-unlimited-crypto
                           Enable unlimited crypto policy [disabled]
-  --enable-jfr            Enable Java Flight Recorder support [disabled]
+  --disable-jfr           Disable Java Flight Recorder support [enabled]
   --disable-debug-symbols disable generation of debug symbols [enabled]
   --disable-zip-debug-info
                           disable zipping of debug-info files [enabled]
@@ -4391,7 +4391,7 @@ VS_SDK_PLATFORM_NAME_2017=
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1565695932
+DATE_WHEN_GENERATED=1580996389
 
 ###############################################################################
 #
@@ -19827,7 +19827,7 @@ $as_echo_n "checking whether to build jfr... " >&6; }
 if test "${enable_jfr+set}" = set; then :
   enableval=$enable_jfr;
 else
-  enable_jfr=no
+  enable_jfr=yes
 fi
 
   if test "x$enable_jfr" = "xno"; then

common/autoconf/jdk-options.m4

@@ -440,9 +440,9 @@ AC_DEFUN_ONCE([JDKOPT_SETUP_JDK_OPTIONS],
   # Enable or disable JFR
   #
   AC_MSG_CHECKING([whether to build jfr])
-  AC_ARG_ENABLE(jfr, [AS_HELP_STRING([--enable-jfr],
-      [Enable Java Flight Recorder support @<:@disabled@:>@])],,
-      [enable_jfr=no])
+  AC_ARG_ENABLE(jfr, [AS_HELP_STRING([--disable-jfr],
+      [Disable Java Flight Recorder support @<:@enabled@:>@])],,
+      [enable_jfr=yes])
   if test "x$enable_jfr" = "xno"; then
     ENABLE_JFR=false
   elif test "x$enable_jfr" = "xyes"; then