Move rust memchr impl to libcore

src/libstd/sys/redox/memchr.rs

@@ -11,4 +11,4 @@
 // Original implementation taken from rust-memchr
 // Copyright 2015 Andrew Gallant, bluss and Nicolas Koch
 
-pub use sys_common::memchr::fallback::{memchr, memrchr};
+pub use core::slice::memchr::{memchr, memrchr};

src/libstd/sys/unix/memchr.rs

@@ -50,7 +50,7 @@ pub fn memrchr(needle: u8, haystack: &[u8]) -> Option<usize> {
 
     #[cfg(not(target_os = "linux"))]
     fn memrchr_specific(needle: u8, haystack: &[u8]) -> Option<usize> {
-        ::sys_common::memchr::fallback::memrchr(needle, haystack)
+        ::core::slice::memchr::memrchr(needle, haystack)
     }
 
     memrchr_specific(needle, haystack)

src/libstd/sys/wasm/memchr.rs

@@ -8,4 +8,4 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub use sys_common::memchr::fallback::{memchr, memrchr};
+pub use core::slice::memchr::{memchr, memrchr};

src/libstd/sys/windows/memchr.rs

@@ -12,4 +12,4 @@
 // Copyright 2015 Andrew Gallant, bluss and Nicolas Koch
 
 // Fallback memchr is fastest on windows
-pub use sys_common::memchr::fallback::{memchr, memrchr};
+pub use core::slice::memchr::{memchr, memrchr};