Remove unused directives

Author: LegNeato

tests/compiletests/ui/lang/core/intrinsics/black_box.rs

@@ -1,8 +1,6 @@
 // build-pass
 // compile-flags: -C llvm-args=--disassemble-fn=black_box::disassemble
 #![no_std]
-#![allow(internal_features)]
-#![feature(core_intrinsics)]
 
 use core::hint::black_box;
 use spirv_std::spirv;
@@ -16,8 +14,6 @@ pub fn main(#[spirv(descriptor_set = 0, binding = 0, storage_buffer)] out: &mut
     }
 }
 
-// Exercise scalars, arrays, references, pairs, and ZSTs
-// This ensures each `black_box` backend path is hit: Immediate, Ref, Pair, ZeroSized.
 #[inline(never)]
 pub fn disassemble() -> [u32; 12] {
     let x = 42i32;

tests/compiletests/ui/lang/core/intrinsics/black_box.stderr

@@ -2,15 +2,15 @@ warning: black_box intrinsic does not prevent optimization in Rust GPU
 
 %1 = OpFunction  %2  DontInline %3
 %4 = OpLabel
-OpLine %5 39 17
+OpLine %5 32 17
 %6 = OpIAdd  %7  %8 %9
-OpLine %5 48 19
+OpLine %5 41 19
 %10 = OpIAdd  %7  %11 %12
-OpLine %5 54 8
+OpLine %5 47 8
 %13 = OpBitcast  %7  %14
 OpLine %15 1092 17
 %16 = OpBitcast  %7  %17
-OpLine %5 53 4
+OpLine %5 46 4
 %18 = OpCompositeConstruct  %2  %13 %16 %19 %20 %21 %22 %6 %23 %10 %24 %24 %24
 OpNoLine
 OpReturnValue %18