Replace __gcov_flush with __gcov_dump + __gcov_reset

compiler-rt removed __gcov_flush with https://reviews.llvm.org/D83149.

Test: m NATIVE_COVERAGE=true NATIVE_COVERAGE_PATHS=* rand_emmc_perf
Change-Id: Ib35ee97fb62ff0e81c0ca0c64a423749b86e1619
2 files changed