RFR: 8293245: x86_64: Extract Adler32 stub implementation into stubGenerator_x86_64_adler.cpp [v2]

[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 incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10126/files
  - new: https://git.openjdk.org/jdk/pull/10126/files/69e427b3..69e427b3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10126&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10126&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 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