Merge branch 'feature/fix-nsec-performance' into libgit-next-1.7.2

Author: zawata

src/libgit2/index.h

@@ -86,6 +86,8 @@ GIT_INLINE(bool) git_index_time_eq(const git_index_time *one, const git_index_ti
 		return false;
 
 #ifdef GIT_USE_NSEC
+	if (one->nanoseconds == 0 || two->nanoseconds == 0)
+		return true;
 	if (one->nanoseconds != two->nanoseconds)
 		return false;
 #endif
@@ -111,6 +113,8 @@ GIT_INLINE(bool) git_index_entry_newer_than_index(
 		return true;
 	else if ((int32_t)index->stamp.mtime.tv_sec > entry->mtime.seconds)
 		return false;
+	else if (entry->mtime.nanoseconds == 0 || index->stamp.mtime.tv_nsec == 0)
+		return true;
 	else
 		return (uint32_t)index->stamp.mtime.tv_nsec <= entry->mtime.nanoseconds;
 #else