[sanitizer-coverage] Add new coverage dump interface
libsanitizer/
* include/santizer/coverage_interface.h
(__sanitizer_dump_coverage): New function.
* sanitizer_common/sanitizer_interface_internal.h
(__sanitizer_dump_coverage): Likewise.
* sanitizer_common/sanitizer_coverage_libcdep_new.cc: New file.
* sanitizer/Makefile.am: Updated.
* sanitzer/Makefile.in: Updated.
Partially backported from LLVM mainline r289498, r291267, r291736, r289851.
Change-Id: I6c13ca8e6e7cfb3c98596970c8ba243296464eeb
Signed-off-by: Dmitriy Nikiforov <d.nikiforov@partner.samsung.com>