RFR 8202379: ARM32 is broken after JDK-8201543 (Modularize C1 GC barriers)

[Aleksey Shipilev]

Bug:
  https://bugs.openjdk.java.net/browse/JDK-8202379

Fix:
  http://cr.openjdk.java.net/~shade/8202379/webrev.01/

Testing: arm32 build, Raspi 3 runs (some selected jcstress tests)

Thanks,
-Aleksey