RFR: Fix check for volatile in putfield_or_static

[Arthur Eubanks]

rdx contains the raw flags without shifts. We want to check if it contains the volatile bit, so testl against the
volatile bit.

-------------

Commit messages:
 - Fix check for volatile in putfield_or_static

Changes: https://git.openjdk.java.net/tsan/pull/4/files
 Webrev: https://webrevs.openjdk.java.net/tsan/4/webrev.00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/tsan/pull/4.diff
  Fetch: git fetch https://git.openjdk.java.net/tsan pull/4/head:pull/4

PR: https://git.openjdk.java.net/tsan/pull/4