Add functions to interact with ASan and MSan, and some sample uses

webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c

Index: webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c b/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
index 4dcf49b6e7b76f6893276d658b0a5658e5fc3bd4..8dcb6b75a0686db651d5bb1f366abed90a2b90e0 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
+++ b/webrtc/modules/audio_coding/codecs/ilbc/create_augmented_vec.c
@@ -18,6 +18,7 @@
 
 #include "defines.h"
 #include "constants.h"
+#include "webrtc/base/sanitizer.h"
 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
 
 /*----------------------------------------------------------------*
@@ -40,6 +41,9 @@ void WebRtcIlbcfix_CreateAugmentedVec(
    */
   size_t interp_len = WEBRTC_SPL_MIN(index, 4);
 
+  rtc_MsanCheckInitialized(buffer - index - interp_len, sizeof(buffer[0]),
+                           index + interp_len);

[kwiberg-webrtc, 2016/08/30 19:55:28]

This is another example of a rtc_MsanCheckInitialized() call that one would
really rather not have, but which is probably best to leave in given that it
unfortunately describes the way the surrounding code works.

+
   ilow = index - interp_len;
 
   /* copy the first noninterpolated part */