Suppress false reports on StackWalk64 and leaks below RtlInitializeCriticalSectionAndSpinCount

TBR=bruening
BUG=http://code.google.com/p/drmemory/issues/detail?id=567, 466
Review URL: http://codereview.chromium.org/7758005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98440 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions.txt

@@ -374,6 +374,11 @@ LEAK
 ...
 WINMM.dll!wave*GetNumDevs
 
+# http://code.google.com/p/drmemory/issues/detail?id=466
+LEAK
+ntdll.dll!RtlRunOnceBeginInitialize
+ntdll.dll!RtlInitializeCriticalSectionAndSpinCount
+
 # http://code.google.com/p/drmemory/issues/detail?id=471
 UNINITIALIZED READ
 *!media::AudioRendererAlgorithmOLA::Crossfade<unsigned char>
@@ -480,6 +485,18 @@ USER32.dll!CreateWindowExW
 *!views::TooltipManagerWin::Init
 *!views::TooltipManagerWin::TooltipManagerWin
 
+# http://code.google.com/p/drmemory/issues/detail?id=567
+UNINITIALIZED READ
+dbghelp.dll!*
+...
+dbghelp.dll!StackWalk64
+
+LEAK
+*!*
+dbghelp.dll!*
+...
+dbghelp.dll!StackWalk64
+
 ############################
 # TODO(timurrrr): investigate these
 UNINITIALIZED READ