RFR: 8293999: [JVMCI] need support for aligned constants in generated code larger than 8 bytes [v2]

[Boris Ulasevich]

> 8293999: [JVMCI] need support for aligned constants in generated code larger than 8 bytes

Boris Ulasevich has updated the pull request incrementally with one additional commit since the last revision:

  adding CodeSection._const_section_alignment field instead of 64 bytes alignment for all JVMCI nmethods

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10392/files
  - new: https://git.openjdk.org/jdk/pull/10392/files/80693ef8..f743a421

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10392&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10392&range=00-01

  Stats: 68 lines in 5 files changed: 25 ins; 36 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/10392.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10392/head:pull/10392

PR: https://git.openjdk.org/jdk/pull/10392