adjust suppression for uninit read on ThreadState::visitStack

TBR=earthdok@chromium.org
BUG=340752

Review URL: https://codereview.chromium.org/398053005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283618 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions_full.txt

@@ -1957,9 +1957,9 @@ osmesa.dll!_tnl_generic_interp
 UNINITIALIZED READ
 name=bug_340752
 ...
-*!WebCore::ThreadState::visitStack
-*!WebCore::ThreadState::trace
-*!WebCore::ThreadState::visitRoots
+*!*::ThreadState::visitStack
+*!*::ThreadState::trace
+*!*::ThreadState::visitRoots
 
 UNINITIALIZED READ
 name=bug_343663