[15] RFR(M) 8240976: [JVMCI] MethodProfileWidth flag is broken

[Vladimir Kozlov]

Removing JVMCI code which is not used and rotten.

Doug S. wrote: "Graal never got around to actually using method profiles
so the MethodProfileWidth code is pretty much untested/bit rotten.
I suggest removing it until such time that resources are available for
further investigating use of method profiles in Graal (or C2)."

http://cr.openjdk.java.net/~kvn/8240976/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8240976

Tested hs-tier1 (runs graalunit tests) and hs-tier3-graal

Thanks,
Vladimir