asan: remove left-over code from submitted in rev r232501

__sanitizer_cov_hint is part of a different functionality
and was not intended to be submitted.

llvm-svn: 232506

compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep.cc

@@ -806,13 +806,6 @@ void CoverageUpdateMapping() {
 }  // namespace __sanitizer
 
 extern "C" {
-SANITIZER_INTERFACE_ATTRIBUTE WEAK
-void __sanitizer_cov_hint(uptr g, u64 c, u64 v) {
-  (void)g;
-  (void)c;
-  (void)v;
-}
-
 SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov(u32 *guard) {
   coverage_data.Add(StackTrace::GetPreviousInstructionPc(GET_CALLER_PC()),
                     guard);