adjust armv7a-vex-v5 target features for more aggressive hardware optimization

Author: Tropix126

compiler/rustc_target/src/spec/targets/armv7a_vex_v5.rs

@@ -15,11 +15,12 @@ pub(crate) fn target() -> Target {
         data_layout: "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64".into(),
         arch: "arm".into(),
         options: TargetOptions {
-            abi: "eabi".into(),
+            cpu: "cortex-a9".into(),
+            abi: "eabihf".into(),
             linker_flavor: LinkerFlavor::Gnu(Cc::No, Lld::Yes),
             linker: Some("rust-lld".into()),
             link_script: Some(LINK_SCRIPT.into()),
-            features: "+v7,+thumb2,+soft-float,-neon,+strict-align".into(),
+            features: "+v7,+thumb2,+vfp3,+neon".into(),
             relocation_model: RelocModel::Static,
             disable_redzone: true,
             max_atomic_width: Some(64),