RFR: 8238737: remove DeoptimizeAllClassesRate from CTW library

[Igor Ignatyev]

Hi all,

after [8238247 ](https://bugs.openjdk.java.net/browse/JDK-8238247), `DeoptimizeAllClassesRate` property became
completely useless, and as I mentioned in the
[review](https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-February/036927.html), I didn't (and still
don't) have any idea why we added this at the first place.

I have looked into the old implementation of CTW (one in `/src/share/vm/classfile/classLoader.cpp`) both at the time
Java impl. was added by [8012447](https://bugs.openjdk.java.net/browse/JDK-8012447) and the old impl. was removed by
[8214917](https://bugs.openjdk.java.net/browse/JDK-8214917), and there is nothing that would suggest that we had/needed
`DeoptimizeAllClassesRate`, it's not and has never been used by any of our tests, so I'm going to remove it.

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Commit messages:
 - 8238737: remove DeoptimizeAllClassesRate from CTW library

Changes: https://git.openjdk.java.net/jdk/pull/418/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=418&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238737
  Stats: 14 lines in 2 files changed: 0 ins; 12 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/418.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/418/head:pull/418

PR: https://git.openjdk.java.net/jdk/pull/418