Clean up tsan suppression file: 1) remove suppressions that are already fixed. 2) merge duplicated suppressions.
Clean up tsan suppression file:
1) remove suppressions that are already fixed.
2) merge duplicated suppressions.

TBR=mallinath
TEST=tsan try bot
BUG=1205,2078,2080

Review URL: https://webrtc-codereview.appspot.com/2949004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@5033 4adac7df-926f-26a2-2b94-8c16560cd09d

ShiftMediaProject/libilbc,TimothyGu/libilbc,mwgoldsmith/ilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/libilbc,mwgoldsmith/ilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,mwgoldsmith/ilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,TimothyGu/libilbc,mwgoldsmith/ilbc