enable the movrs target feature in core and std

Author: folkertdev

library/core/src/lib.rs

@@ -182,6 +182,7 @@
 #![feature(hexagon_target_feature)]
 #![feature(loongarch_target_feature)]
 #![feature(mips_target_feature)]
+#![feature(movrs_target_feature)]
 #![feature(nvptx_target_feature)]
 #![feature(powerpc_target_feature)]
 #![feature(riscv_target_feature)]