RFR (XL) 8173715: Remove FlatProfiler

[Gerard Ziemski]

hi all,

(this is hotspot part of the change, the jdk part is being reviewed on jdk10-dev at openjdk.java.net)

The FlatProfiler (i.e. -Xprof) has been deprecated for a while, and now it’s the time to remove it.

The changes are XL, but straightforward.

If anyone knows of any other remnants that should still be removed, please let me know.

issue:  https://bugs.openjdk.java.net/browse/JDK-8173715
webrev: http://cr.openjdk.java.net/~gziemski/8173715_rev1_hotspot

passes the following tests:

 JPRT
 RBT test_hotspot/test/serviceability/jvmti
 RBT test_hotspot/test/gc
 RBT test_hotspot/test/compiler
 RBT test_hotspot/test/runtime

Thank you.