8176098: Deprecate FlatProfiler

Reviewed-by: shade, coleenp

hotspot/src/share/vm/Xusage.txt

@@ -12,7 +12,7 @@
     -Xms<size>        set initial Java heap size
     -Xmx<size>        set maximum Java heap size
     -Xss<size>        set java thread stack size
-    -Xprof            output cpu profiling data
+    -Xprof            output cpu profiling data (deprecated)
     -Xfuture          enable strictest checks, anticipating future default
     -Xrs              reduce use of OS signals by Java/VM (see documentation)
     -Xcheck:jni       perform additional checks for JNI functions

hotspot/src/share/vm/runtime/arguments.cpp

@@ -3174,6 +3174,7 @@ jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_m
     // -Xprof
     } else if (match_option(option, "-Xprof")) {
 #if INCLUDE_FPROF
+      log_warning(arguments)("Option -Xprof was deprecated in version 9 and will likely be removed in a future release.");
       _has_profile = true;
 #else // INCLUDE_FPROF
       jio_fprintf(defaultStream::error_stream(),