RFR: 8293245: x86_64: Extract Adler32 stub implementation into stubGenerator_x86_64_adler.cpp [v3]

[Vladimir Ivanov]

> Extract Adler32 stub implementation into a dedicated file (`stubGenerator_x86_64_adler.cpp`).
> 
> Minor cleanups:
>   * got rid of `updateBytesAdler32()` by manually inlining it into  `generate_updateBytesAdler32()`
>   * unified usage of `r14` as a scratch register
>   * added 32-byte alignment for the constants
> 
> Testing: hs-tier1 - hs-tier4

Vladimir Ivanov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - fix
 - Merge branch 'master' into stub.x86_64.adler
 - Move Adler stub definitions into stubGenerator_x86_64_adler.cpp
 - update
 - fix
 - stubGenerator_x86_64.hpp

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Changes: https://git.openjdk.org/jdk/pull/10126/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10126&range=02
  Stats: 542 lines in 6 files changed: 268 ins; 274 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10126.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10126/head:pull/10126

PR: https://git.openjdk.org/jdk/pull/10126