RFR: 8330805: ARM32 build is broken after JDK-8139457

[Aleksei Voitylov]

The JDK-8139457 patch changes the header_size argument of C1_MacroAssembler::allocate_array, the input value now means offset in bytes. The ARM32 allocate_array implementation is fixed accordingly.

Testing: jtreg hotspot, jtreg jdk tier1-3

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Commit messages:
 - JDK-8330805

Changes: https://git.openjdk.org/jdk/pull/18890/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18890&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330805
  Stats: 3 lines in 1 file changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18890.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18890/head:pull/18890

PR: https://git.openjdk.org/jdk/pull/18890