RFR: 8299570: [JVMCI] Insufficient error handling when CodeBuffer is exhausted

[Doug Simon]

This PR fixes the handling of a full CodeBuffer when emitting stubs as part of JVMCI code installation.

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Commit messages:
 - properly handle CodeBuffer exhaustion in JVMCI backend

Changes: https://git.openjdk.org/jdk/pull/11945/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11945&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299570
  Stats: 25 lines in 5 files changed: 19 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/11945.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11945/head:pull/11945

PR: https://git.openjdk.org/jdk/pull/11945