RFR: Fix SerialGC bug in full_process_roots

[Stefan Karlsson]

There seems to have been an inadvertent change to argument to fix_relocations in full_process_roots. The bug doesn't cause any problems, it just calls an expensive operation (fix_oop_relocations) unnecessarily. Restore the old value.

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Commit messages:
 - Fix SerialGC bug in full_process_roots

Changes: https://git.openjdk.java.net/loom/pull/113/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=113&range=00
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/loom/pull/113.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/113/head:pull/113

PR: https://git.openjdk.java.net/loom/pull/113