RFR: 8281681: compiler/profiling/spectrapredefineclass_classloaders/Launcher.java crash when CodeCache is full

[Dean Long]

I wasn't able to reproduce this, but from looking at the core dump, not trying to emit more instructions when the code cache is full should definitely help.

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Commit messages:
 - emit post_call_nop only after checking for CodeCache full

Changes: https://git.openjdk.java.net/loom/pull/93/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=93&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281681
  Stats: 6 lines in 1 file changed: 3 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/loom/pull/93.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/93/head:pull/93

PR: https://git.openjdk.java.net/loom/pull/93