RFR: 8371573: Shenandoah: Fix style of include directive [v2]

[Kelvin Nilsen]

> Fix style of include directive for improved consistency and compatibility with GraalVM conventions.

Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:

  Remove unneeded include

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28219/files
  - new: https://git.openjdk.org/jdk/pull/28219/files/2d926fb9..5c95f64e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28219&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28219&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28219/head:pull/28219

PR: https://git.openjdk.org/jdk/pull/28219