RFR: 8254352: 3 compiler tests failed with "assert(allocates2(pc)) failed"

[Vladimir Kozlov]

JDK-8252847 changes added new AVX3 specific stubs for arraycopy and increased code buffer size but it was not enough.
On Windows we need 3500 bytes more because additional code is used to preserve registers.

Tested hs tier1-3 and ran bug's tests on machine where they failed.

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Commit messages:
 - 8254352: 3 compiler tests failed with "assert(allocates2(pc)) failed: not in CodeBuffer memory"

Changes: https://git.openjdk.java.net/jdk/pull/592/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=592&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254352
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/592.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/592/head:pull/592

PR: https://git.openjdk.java.net/jdk/pull/592