RFR: 8262280: Incorrect exception handling for VMThread in class redefinition

[Coleen Phillimore]

This is a trivial change to remove the last TRAPS from redefine_single_class which is called by the VM thread during a safepoint.
Tested with serviceability/jvmti/RedefineClasses, vmTestbase/nsk/jvmti,jdi and jdk/java/lang/instrument tests.  And tier1 sanity in progress.

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Commit messages:
 - 8262280: Incorrect exception handling for VMThread in class redefinition

Changes: https://git.openjdk.java.net/jdk/pull/3310/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3310&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262280
  Stats: 19 lines in 2 files changed: 0 ins; 0 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3310.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3310/head:pull/3310

PR: https://git.openjdk.java.net/jdk/pull/3310