RFR: 8257798: [PPC64] undefined reference to Klass::vtable_start_offset()

[Martin Doerr]

We need to include "oops/klass.inline.hpp" in adlc generated cpp files. Otherwise we get linker errors with some gcc versions when it assumes that all usages are inlined.
Change also includes minor cleanup.

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Commit messages:
 - 8257798: [PPC64] undefined reference to Klass::vtable_start_offset()

Changes: https://git.openjdk.java.net/jdk/pull/1660/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1660&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257798
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1660.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1660/head:pull/1660

PR: https://git.openjdk.java.net/jdk/pull/1660