RFR (XS) 8151017: [TESTBUG] test/compiler/c1/CanonicalizeArrayLength does not work on product builds

[Aleksey Shipilev]

Hi,

Please review the fix for a testbug:
  https://bugs.openjdk.java.net/browse/JDK-8151017

Webrev:
  http://cr.openjdk.java.net/~shade/8151017/webrev.01/

Test uses develop/diagnostic VM options: ScavengeRootsInCode and
PatchALot, and we need to preceed the test configs with
-XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions to make
it work on product bits.

The test passes now on Linux x86_64/release.

Thanks,
-Aleksey

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