Update the stdsimd submodule

Add a new cmpxchg16b intrinsics for x86_64!
rust-lang · Jan 2, 2019 · c0662a0 · c0662a0
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commit c0662a0
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diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
@@ -110,6 +110,7 @@
 #![feature(aarch64_target_feature)]
 #![feature(wasm_target_feature)]
 #![feature(avx512_target_feature)]
+#![cfg_attr(not(stage0), feature(cmpxchg16b_target_feature))]
 #![feature(const_slice_len)]
 #![feature(const_str_as_bytes)]
 #![feature(const_str_len)]

diff --git a/src/stdsimd b/src/stdsimd