Update target feature tests

Author: heiher

tests/ui/target-feature/abi-required-target-feature-flag-disable.loongarch.stderr

@@ -3,9 +3,5 @@ warning: target feature `d` must be enabled to ensure that the ABI of the curren
    = note: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #116344 <https://github.com/rust-lang/rust/issues/116344>
 
-warning: unstable feature specified for `-Ctarget-feature`: `d`
-   |
-   = note: this feature is not stably supported; its behavior can change in the future
-
-warning: 2 warnings emitted
+warning: 1 warning emitted
 

tests/ui/target-feature/abi-required-target-feature-flag-disable.rs

@@ -24,4 +24,4 @@
 pub trait Sized {}
 
 //~? WARN must be enabled to ensure that the ABI of the current target can be implemented correctly
-//[x86,riscv,loongarch]~? WARN unstable feature specified for `-Ctarget-feature`
+//[x86,riscv]~? WARN unstable feature specified for `-Ctarget-feature`