8362564: hotspot/jtreg/compiler/c2/TestLWLockingCodeGen.java fails on static JDK on x86_64 with AVX instruction extensions

[jianglizhou]

Please review this fix that increases the x86 initial stubs size to 21000 for NOT_PRODUCT only case.

Also included as part of the PR (suggested by @rasbold), moved the assert to after the stubs log info output.

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Issue

• JDK-8362564: hotspot/jtreg/compiler/c2/TestLWLockingCodeGen.java fails on static JDK on x86_64 with AVX instruction extensions (Bug - P3)

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• 00: Full (3cfac836)