RFR: 8254955: x86: MethodHandlesAdapterBlob is too big

[Claes Redestad]

At some point JSR 292 was reworked to generate all but a small handful of interpreter stubs lazily, leaving the
MethodHandlesAdapterBlob with a bit too much room to spare.

The remaining stubs use less than 1000 bytes of memory in product builds, and less than 3k in debug builds. This patch
adjust the sizes accordingly.

Other platforms (except zero) seem like they could use a similar adjustment, but I don't have hardware available to
check how big the interpreter stubs get on anything but x86 so I'll leave them untouched unless someone can run the
numbers (`java -XX:+UnlockDiagnosticVMOptions -XX:+VerifyMethodHandles -XX:+LogCompilation` - grep the hotspot_log
generated for MethodHandlesAdapterBlob or just blob since it's the first one)

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Commit messages:
 - Merge branch 'master' into mh_adapters_sizing
 - methodHandlesAdapterBlob is excessively sized

Changes: https://git.openjdk.java.net/jdk/pull/717/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=717&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254955
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/717.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/717/head:pull/717

PR: https://git.openjdk.java.net/jdk/pull/717