RFR: 8377172: Change datatype of CodeEntryAlignment to uint [v4]

[Leo Korinth]

> The main idea of this change is to remove an implicitly narrowing conversion to int from intx (`int code_alignment()`).
> 
> CodeEntryAlignment is constrained to not be bigger than CodeCacheSegmentSize that is itself constrained to be in the range(1, 1024). The data type should really be a uint16_t as its allowed range is [16-1024], but we have no such support for VM flags. uint will do, and will simplify the code greatly (five less casts, six if we count the implicit narrowing cast).
> 
> This change is inspired by my change 8376892: Allow conversion warnings in subsets of the code base.
> 
> Completed test tier 1-3.

Leo Korinth has updated the pull request incrementally with one additional commit since the last revision:

  copyright

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29637/files
  - new: https://git.openjdk.org/jdk/pull/29637/files/0277648c..00bf1b01

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29637&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29637&range=02-03

  Stats: 14 lines in 14 files changed: 0 ins; 0 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/29637.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29637/head:pull/29637

PR: https://git.openjdk.org/jdk/pull/29637