RFR: 8341272: Factory to create wide iinc instruction with small arguments [v2]

[Trevor Bond]

> Add a new factory method to `IncrementInstruction` that allows the explicit creation of a wide iinc instruction, even with a `slot` and `constant` that could fit into a normal iinc instruction. Previously, only one factory for iinc instructions existed, which inferred the type of instruction needed given the size of `slot` and `constant`. Add additional test cases for the new factory as well. All tier 1 tests and classfile tests have passed with these changes.

Trevor Bond has updated the pull request incrementally with one additional commit since the last revision:

  Clean up javadocs and address other review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28729/files
  - new: https://git.openjdk.org/jdk/pull/28729/files/4acc5b44..44612c5f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28729&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28729&range=00-01

  Stats: 33 lines in 3 files changed: 8 ins; 19 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/28729.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28729/head:pull/28729

PR: https://git.openjdk.org/jdk/pull/28729