Remove unneeded target-features attribute

Author: ostannard

llvm/test/CodeGen/ARM/big-endian-vector-trunc.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
 ; RUN: llc -mtriple=armebv7-unknown-none-eabihf -mattr=+neon < %s | FileCheck %s
 
-define i32 @test(i64 %arg1) "target-features"="+neon" {
+define i32 @test(i64 %arg1) {
 ; CHECK-LABEL: test:
 ; CHECK:       @ %bb.0: @ %entry
 ; CHECK-NEXT:    subs r1, r1, #1