Valgrind: Suppress another Mac memory error....

tools/valgrind/memcheck/suppressions_mac.txt

Index: tools/valgrind/memcheck/suppressions_mac.txt
===================================================================
--- tools/valgrind/memcheck/suppressions_mac.txt	(revision 45677)
+++ tools/valgrind/memcheck/suppressions_mac.txt	(working copy)
@@ -1068,3 +1068,24 @@
    fun:-[NSIBObjectData initWithCoder:]
    fun:_decodeObjectBinary
 }
+{
+   bug_42622
+   Memcheck:Addr4
+   fun:_ZN3WTF11currentTimeEv
+   fun:_ZN7WebCore5EventC2ERKNS_12AtomicStringEbb
+   fun:_ZN7WebCore12MessageEventC2EN3WTF10PassRefPtrINS_21SerializedScriptValueEEERKNS_6StringES7_NS2_INS_9DOMWindowEEENS1_10PassOwnPtrINS1_6VectorINS1_6RefPtrINS_11MessagePortEEELm1EEEEE
+   fun:_ZN7WebCore12MessageEventC1EN3WTF10PassRefPtrINS_21SerializedScriptValueEEERKNS_6StringES7_NS2_INS_9DOMWindowEEENS1_10PassOwnPtrINS1_6VectorINS1_6RefPtrINS_11MessagePortEEELm1EEEEE
+   fun:_ZN7WebCore12MessageEvent6createEN3WTF10PassOwnPtrINS1_6VectorINS1_6RefPtrINS_11MessagePortEEELm1EEEEENS1_10PassRefPtrINS_21SerializedScriptValueEEERKNS_6StringESE_NS9_INS_9DOMWindowEEE
+   fun:_ZN7WebCore18createConnectEventEN3WTF10PassRefPtrINS_11MessagePortEEE
+   fun:_ZN6WebKit19WebSharedWorkerImpl11connectTaskEPN7WebCore22ScriptExecutionContextEPS0_N3WTF10PassOwnPtrINS1_18MessagePortChannelEEE
+   fun:_ZN7WebCore18GenericWorkerTask2IPN6WebKit19WebSharedWorkerImplES3_PNS_18MessagePortChannelEN3WTF10PassOwnPtrIS4_EEE11performTaskEPNS_22ScriptExecutionContextE
+   fun:_ZN7WebCore13WorkerRunLoop4Task11performTaskEPNS_22ScriptExecutionContextE
+   fun:_ZN7WebCore13WorkerRunLoop9runInModeEPNS_13WorkerContextERKNS_13ModePredicateE
+   fun:_ZN7WebCore13WorkerRunLoop3runEPNS_13WorkerContextE
+   fun:_ZN7WebCore12WorkerThread12runEventLoopEv
+   fun:_ZN7WebCore12WorkerThread12workerThreadEv
+   fun:_ZN7WebCore12WorkerThread17workerThreadStartEPv
+   fun:_ZN3WTFL16threadEntryPointEPv
+   fun:_pthread_start
+   fun:thread_start
+}