Move UBSan warnings from a blacklist to the source

webrtc/common_audio/signal_processing/levinson_durbin.c

Index: webrtc/common_audio/signal_processing/levinson_durbin.c
diff --git a/webrtc/common_audio/signal_processing/levinson_durbin.c b/webrtc/common_audio/signal_processing/levinson_durbin.c
index c8e58ba4555e4972296dacf7044e5cb8b51ff976..3e16b23f8b01c8e53ba85331e2d71dfecb342fe1 100644
--- a/webrtc/common_audio/signal_processing/levinson_durbin.c
+++ b/webrtc/common_audio/signal_processing/levinson_durbin.c
@@ -16,11 +16,13 @@
  */
 
 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+#include "webrtc/rtc_base/sanitizer.h"
 
 #define SPL_LEVINSON_MAXORDER 20
 
-int16_t WebRtcSpl_LevinsonDurbin(const int32_t* R, int16_t* A, int16_t* K,
-                                 size_t order)
+int16_t RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_LevinsonDurbin(const int32_t* R, int16_t* A, int16_t* K,
+                         size_t order)
 {
     size_t i, j;
     // Auto-correlation coefficients in high precision
@@ -44,6 +46,8 @@ int16_t WebRtcSpl_LevinsonDurbin(const int32_t* R, int16_t* A, int16_t* K,
     for (i = 0; i <= order; ++i)
     {
         temp1W32 = R[i] * (1 << norm);
+        // UBSan: 12 * 268435456 cannot be represented in type 'int'
+
         // Put R in hi and low format
         R_hi[i] = (int16_t)(temp1W32 >> 16);
         R_low[i] = (int16_t)((temp1W32 - ((int32_t)R_hi[i] * 65536)) >> 1);