RFR: 8357506: [JVMCI] Consolidate eager JVMCI initialization code [v2]

[Doug Simon]

> While working on [JDK-8357135](https://bugs.openjdk.org/browse/JDK-8357135), I was reminded that some of the code implementing eager JVMCI compiler initialization (i.e. `-XX:+EagerJVMCI`) is in helper methods such as `JVMCIRuntime::call_getCompiler` that sound general purpose but are only used for eager JVMCI compiler initialization. This PR inlines `JVMCIRuntime::call_getCompiler` and renames `JVMCI::initialize_compiler` to `initialize_compiler_in_create_vm` to make its single use case clearer.

Doug Simon has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  consolidate JVMCI eager initialization

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25369/files
  - new: https://git.openjdk.org/jdk/pull/25369/files/c069487d..3b4bf20e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25369&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25369&range=00-01

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/25369.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25369/head:pull/25369

PR: https://git.openjdk.org/jdk/pull/25369