Update the stdsimd submodule

alexcrichton · alexcrichton · commit 07a3d690890f · 2018-12-10T12:05:33.000-08:00
Includes some new stabilized intrinsics for the wasm32 target! Closes #56292
diff --git a/src/stdsimd b/src/stdsimd
@@ -1 +1 @@
-Subproject commit 5e628c5120c619a22799187371f057ec41e06f87
+Subproject commit 3c0503db8439928e42c1175f0009c506fc874ae9
