RFR: 8244376: possibly stale comment above "struct SharedGlobals" in synchronizer.cpp

[Daniel D.Daugherty]

Trivial change to delete a stale comment block.

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Commit messages:
 - 8244376: possibly stale comment above "struct SharedGlobals" in synchronizer.cpp

Changes: https://git.openjdk.java.net/jdk/pull/1212/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1212&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244376
  Stats: 18 lines in 1 file changed: 0 ins; 18 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1212.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1212/head:pull/1212

PR: https://git.openjdk.java.net/jdk/pull/1212