RFR: Fix location of transform call in oop_promotion_failed

[Stefan Karlsson]

Manual inspection of the ParallelGC code showed that we transform the chunk *after* the oops are pushed and published to other threads. I couldn't reproduce a crash with this, but this looks wrong and should be fixed. Just move the transform to *before* the push.

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Commit messages:
 - Fix location of transform call in oop_promotion_failed

Changes: https://git.openjdk.java.net/loom/pull/159/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=159&range=00
  Stats: 4 lines in 1 file changed: 2 ins; 2 del; 0 mod
  Patch: https://git.openjdk.java.net/loom/pull/159.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/159/head:pull/159

PR: https://git.openjdk.java.net/loom/pull/159