std: Use the fallback impl for memrchr on non-linux

bluss · bluss · commit 078a6231a78a · 2016-01-20T18:00:34.000+01:00
This code was never used(!). This brings the memrchr improvements to
non-linux platforms (LineWriter / buffered stdout benefits).
diff --git a/src/libstd/memchr.rs b/src/libstd/memchr.rs
@@ -98,7 +98,7 @@ pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
 
     #[cfg(not(target_os = "linux"))]
     fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {
-        haystack.iter().rposition(|&b| b == needle)
+        fallback::memrchr(needle, haystack)
     }
 
     memrchr_specific(needle, haystack)

Original file line number	Diff line number	Diff line change
`@@ -98,7 +98,7 @@ pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {`
`98`	`98`
`99`	`99`	`#[cfg(not(target_os = "linux"))]`
`100`	`100`	`fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {`
`101`		`- haystack.iter().rposition(\|&b\| b == needle)`
	`101`	`+ fallback::memrchr(needle, haystack)`
`102`	`102`	`}`
`103`	`103`
`104`	`104`	`memrchr_specific(needle, haystack)`