[sanitizer] More interceptors.

getpwnam, getpwuid, getpwnam_r, getpwuid_r, clock_getres, clock_gettime,
clock_settime, getitimer, setitimer, sigaction (MSan).



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178465 91177308-0d34-0410-b5e6-96231b3b80d8