Update stdarch submodule

jyn514 · jyn514 · commit ca987789ea2d · 2020-10-01T13:06:22.000-04:00
The primary purpose is to get the fixes from rust-lang/stdarch#920 and rust-lang/stdarch#922. The other changes included are rust-lang/stdarch#917 and rust-lang/stdarch#919.
diff --git a/library/stdarch b/library/stdarch
@@ -1 +1 @@
-Subproject commit b422b0180f7c3327375a63a3e6660e432b9ec75d
+Subproject commit 3c3664355ef46e788b53080e521d6542fbddfd84
