RFR: 8259580: Shenandoah: uninitialized label in VerifyThreadGCState

[Aleksey Shipilev]

"label" is passed, but never hooked into the field. So instead of reporting a GC bug, Verifier would probably crash itself trying to read garbage memory.

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Commit messages:
 - 8259580: Shenandoah: uninitialized label in VerifyThreadGCState

Changes: https://git.openjdk.java.net/jdk/pull/2033/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2033&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259580
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2033.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2033/head:pull/2033

PR: https://git.openjdk.java.net/jdk/pull/2033