MemorySanitizer: blacklist two false positives.

BUG=394028, 385074
TBR=eugenis@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/405613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284073 0039d316-1c4b-4281-b951-d872f2087c98

tools/msan/blacklist.txt

@@ -24,3 +24,9 @@ fun:*ProcessOnePixel*
 
 # An actual Chromium bug which is blocking our progress. http://crbug.com/334448
 fun:*UTF8GenericReplaceInternal*
+
+# False positives due to use of linux_syscall_support. http://crbug.com/394028
+fun:google_breakpad*LinuxDumper*ReadAuxv
+
+# Bug in MSan, fixed in clang r211022. http://crbug.com/385074
+fun:*TEST_SeccompRetTrace*