RFR: 8254351: Minimal VM build fails with undeclared identifier 'MaxVectorSize' after JDK-8252847 [v2]

[Jie Fu]

> To fix the bug, #if COMPILER2_OR_JVMCI was added.
> Please review it. Thanks.
> 
> Testing:
>   - Minimal and server-fastdebug builds on x86

Jie Fu has updated the pull request incrementally with one additional commit since the last revision:

  Fix minimal-debug build failure

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/588/files
  - new: https://git.openjdk.java.net/jdk/pull/588/files/6aa5f9f1..4bb6e2a0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=588&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=588&range=00-01

  Stats: 29 lines in 2 files changed: 16 ins; 12 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/588.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/588/head:pull/588

PR: https://git.openjdk.java.net/jdk/pull/588