Bug 1443342 - Opt one HashFunctions.h function out of integer-overflow sanitizing and don't blacklist HashFunctions.h. r=froydnj

--HG--
extra : rebase_source : a33b53362c1f9ce96df22a321990a45a224af9d6

build/sanitizers/ubsan_signed_overflow_blacklist.txt

@@ -228,7 +228,6 @@ src:*/mozglue/misc/TimeStamp.h
 #
 src:*/dom/canvas/MurmurHash3.cpp
 src:*/gfx/skia/skia/include/private/SkChecksum.h
-src:*/HashFunctions.h
 src:*/intl/icu/source/common/unifiedcache.h
 src:*/mfbt/SHA1.cpp
 src:*/modules/zlib/src/adler32.c

build/sanitizers/ubsan_unsigned_overflow_blacklist.txt

@@ -235,7 +235,6 @@ src:*/mozglue/misc/TimeStamp.h
 #
 src:*/dom/canvas/MurmurHash3.cpp
 src:*/gfx/skia/skia/include/private/SkChecksum.h
-src:*/HashFunctions.h
 src:*/intl/icu/source/common/unifiedcache.h
 src:*/mfbt/SHA1.cpp
 src:*/modules/zlib/src/adler32.c

mfbt/HashFunctions.h

@@ -352,6 +352,7 @@ private:
       return mV0 ^ mV1 ^ mV2 ^ mV3;
     }
 
+    MOZ_NO_SANITIZE_UNSIGNED_OVERFLOW
     void sipRound()
     {
       mV0 += mV1;