detect: Support run-time detection of FEAT_LSE on aarch64 NetBSD

.github/.cspell/project-dictionary.txt

@@ -3,19 +3,22 @@ adcs
 addc
 adde
 armasm
+armreg
 autogen
 auxv
 auxvec
 backoff
 binutils
 bitops
+bytecount
 callthru
 casp
 cbnz
 cdsg
 cfgs
 cinc
 cirruslabs
+clidr
 cmpd
 cmpld
 cmpxchg
@@ -24,6 +27,7 @@ cpsid
 cpsie
 CPSR
 cpuid
+cpus
 crand
 crandc
 cror
@@ -53,6 +57,7 @@ isync
 ldaxp
 ldxp
 libcalls
+libpthread
 libtcl
 libtest
 lqarx
@@ -63,13 +68,20 @@ memcpy
 metavar
 mfence
 mgba
+midr
 miscompilation
 mmfr
 moreutils
+mpidr
 mstatus
+mvfr
+NCPU
+NCPUONLINE
 newtype
 nographic
 nostdinc
+NPROCESSORS
+ONLN
 opensbi
 osxsave
 prefetcher
@@ -79,6 +91,7 @@ qword
 RAII
 rclass
 reentrancy
+revidr
 sbcs
 seqlock
 sete
@@ -101,6 +114,7 @@ subc
 subcmd
 subfe
 syscall
+sysctlbyname
 systemsim
 tagme
 Tlink
@@ -121,3 +135,4 @@ xgetbv
 xmmword
 xsave
 xsub
+zeroable

src/imp/atomic128/aarch64.rs

@@ -53,13 +53,17 @@ include!("macros.rs");
     path = "detect/aarch64_linux_getauxval.rs"
 )]
 #[cfg_attr(target_os = "windows", path = "detect/aarch64_windows.rs")]
-#[cfg_attr(any(target_os = "freebsd", target_os = "openbsd"), path = "detect/aarch64_aa64reg.rs")]
+#[cfg_attr(
+    any(target_os = "freebsd", target_os = "netbsd", target_os = "openbsd"),
+    path = "detect/aarch64_aa64reg.rs"
+)]
 #[cfg_attr(
     not(any(
         all(target_os = "linux", target_env = "gnu"),
         target_os = "android",
         target_os = "windows",
         target_os = "freebsd",
+        target_os = "netbsd",
         target_os = "openbsd"
     )),
     path = "detect/aarch64_std.rs"
@@ -304,6 +308,7 @@ unsafe fn atomic_compare_exchange(
             target_os = "android",
             target_os = "windows",
             target_os = "freebsd",
+            target_os = "netbsd",
             target_os = "openbsd",
         )
     )))]
@@ -319,6 +324,7 @@ unsafe fn atomic_compare_exchange(
             target_os = "android",
             target_os = "windows",
             target_os = "freebsd",
+            target_os = "netbsd",
             target_os = "openbsd",
         )
     ))]