Rollup merge of #48887 - alexcrichton:update-stdsimd, r=kennytm

Mark-Simulacrum · web-flow · commit bf49a3b7bcab · 2018-03-10T06:40:36.000-07:00
Update stdsimd module

Pulls in a redesigned `std::simd` module as well as a replacement for the
`is_target_feature_detected!` macro
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
@@ -74,7 +74,9 @@
 #![feature(concat_idents)]
 #![feature(const_fn)]
 #![feature(custom_attribute)]
+#![feature(doc_cfg)]
 #![feature(doc_spotlight)]
+#![feature(fn_must_use)]
 #![feature(fundamental)]
 #![feature(i128_type)]
 #![feature(inclusive_range_syntax)]
diff --git a/src/stdsimd b/src/stdsimd
@@ -1 +1 @@
-Subproject commit 678cbd325c84070c9dbe4303969fbd2734c0b4ee
+Subproject commit bcb720e55861c38db47f2ebdf26b7198338cb39d
