Enable AddressSanitizer on arm-unknown-linux-gnueabihf and armv7-unknown-linux-gnueabihf

Add SanitizerSet::ADDRESS to the supported_sanitizers for the
arm-unknown-linux-gnueabihf and armv7-unknown-linux-gnueabihf targets.

The AddressSanitizer is already enabled on the armv7-linux-androideabi
platform, which shares the same ARM architecture. There is no reason
these Linux GNU targets should not also support it, as the underlying
LLVM support for ASan on 32-bit ARM is already in place.

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

@@ -1,4 +1,6 @@
-use crate::spec::{Arch, CfgAbi, FloatAbi, Target, TargetMetadata, TargetOptions, base};
+use crate::spec::{
+    Arch, CfgAbi, FloatAbi, SanitizerSet, Target, TargetMetadata, TargetOptions, base,
+};
 
 pub(crate) fn target() -> Target {
     Target {
@@ -24,6 +26,7 @@ pub(crate) fn target() -> Target {
             // linker error, so set it to `true` here.
             // FIXME(#146996): Remove this override once #146996 has been fixed.
             default_uwtable: false,
+            supported_sanitizers: SanitizerSet::ADDRESS,
             ..base::linux_gnu::opts()
         },
     }

compiler/rustc_target/src/spec/targets/armv7_unknown_linux_gnueabihf.rs

@@ -1,4 +1,6 @@
-use crate::spec::{Arch, CfgAbi, FloatAbi, Target, TargetMetadata, TargetOptions, base};
+use crate::spec::{
+    Arch, CfgAbi, FloatAbi, SanitizerSet, Target, TargetMetadata, TargetOptions, base,
+};
 
 // This target is for glibc Linux on ARMv7 without NEON or
 // thumb-mode. See the thumbv7neon variant for enabling both.
@@ -23,6 +25,7 @@ pub(crate) fn target() -> Target {
             max_atomic_width: Some(64),
             mcount: "\u{1}__gnu_mcount_nc".into(),
             llvm_mcount_intrinsic: Some("llvm.arm.gnu.eabi.mcount".into()),
+            supported_sanitizers: SanitizerSet::ADDRESS,
             ..base::linux_gnu::opts()
         },
     }