tsan: intercept fork syscall



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@191144 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: allow to obtain code range for a particular module
this is required to ignore interceptors when called from the module



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@191149 91177308-0d34-0410-b5e6-96231b3b80d8