Create libraries for continuous mode

Bug: http://b/194128476

In continuous mode, the libraries don't need to call
__llvm_profile_write_file.  We still register the signal handler to keep
this change low-touch.

Test: build the new libraries and verify absence of call to
      __llvm_profile_write_file.
Change-Id: I00dc15a56a41494b464a6715242c79845605ebc3
2 files changed