suppress memcheck test errors

tools/valgrind-webrtc/memcheck/suppressions.txt

Index: tools/valgrind-webrtc/memcheck/suppressions.txt
diff --git a/tools/valgrind-webrtc/memcheck/suppressions.txt b/tools/valgrind-webrtc/memcheck/suppressions.txt
index 841a639f74136bcb9fbf0cf6965752b3f4a03f55..1124617dcd45671245ed2bbf751bfcac9d3c9678 100644
--- a/tools/valgrind-webrtc/memcheck/suppressions.txt
+++ b/tools/valgrind-webrtc/memcheck/suppressions.txt
@@ -458,17 +458,27 @@
    ...
 }
 {
-   bug_6444
+   bug_6444_encode
    Memcheck:Unaddressable
    fun:pitch_search
    fun:run_prefilter
    fun:celt_encode_with_ec
    fun:opus_encode_native
+   ...
    fun:opus_encode
    fun:WebRtcOpus_Encode
-   fun:_ZN6webrtc16AudioEncoderOpus10EncodeImplEjN3rtc9ArrayViewIKsEEPNS1_7BufferTIhEE
-   fun:_ZN6webrtc12AudioEncoder6EncodeEjN3rtc9ArrayViewIKsEEPNS1_7BufferTIhEE
-   fun:_ZN6webrtc16AudioDecoderTest11EncodeFrameEPKsmPN3rtc7BufferTIhEE
-   fun:_ZN6webrtc16AudioDecoderTest16EncodeDecodeTestEmidii
-   fun:_ZN6webrtc44AudioDecoderOpusStereoTest_EncodeDecode_Test8TestBodyEv
+   ...
+}
+{
+   bug_6444_decode
+   Memcheck:Unaddressable
+   fun:pitch_search
+   fun:celt_decode_lost
+   fun:celt_decode_with_ec
+   fun:opus_decode_frame
+   ...
+   fun:opus_decode_native
+   fun:opus_decode
+   fun:WebRtcOpus_Decode*
+   ...
 }