Fix broken links

Signed-off-by: cui fliter <imcusg@gmail.com>

Author: cuishuang

compiler/rustc_target/src/spec/thumbv7neon_linux_androideabi.rs

@@ -3,7 +3,7 @@ use crate::spec::{Cc, LinkerFlavor, Lld, Target, TargetOptions};
 // This target if is for the Android v7a ABI in thumb mode with
 // NEON unconditionally enabled and, therefore, with 32 FPU registers
 // enabled as well. See section A2.6.2 on page A2-56 in
-// https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
+// https://web.archive.org/web/20210307234416/https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
 
 // See https://developer.android.com/ndk/guides/abis.html#v7a
 // for target ABI requirements.

compiler/rustc_target/src/spec/thumbv7neon_unknown_linux_gnueabihf.rs

@@ -4,7 +4,7 @@ use crate::spec::{Target, TargetOptions};
 // (for consistency with Android and Debian-based distributions)
 // and with NEON unconditionally enabled and, therefore, with 32 FPU
 // registers enabled as well. See section A2.6.2 on page A2-56 in
-// https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
+// https://web.archive.org/web/20210307234416/https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
 
 pub fn target() -> Target {
     Target {

compiler/rustc_target/src/spec/thumbv7neon_unknown_linux_musleabihf.rs

@@ -4,7 +4,7 @@ use crate::spec::{Target, TargetOptions};
 // (for consistency with Android and Debian-based distributions)
 // and with NEON unconditionally enabled and, therefore, with 32 FPU
 // registers enabled as well. See section A2.6.2 on page A2-56 in
-// https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
+// https://web.archive.org/web/20210307234416/https://static.docs.arm.com/ddi0406/cd/DDI0406C_d_armv7ar_arm.pdf
 
 pub fn target() -> Target {
     Target {

library/std/src/sys/personality/gcc.rs

@@ -95,7 +95,7 @@ const UNWIND_DATA_REG: (i32, i32) = (4, 5); // a0, a1
 cfg_if::cfg_if! {
     if #[cfg(all(target_arch = "arm", not(target_os = "ios"), not(target_os = "tvos"), not(target_os = "watchos"), not(target_os = "netbsd")))] {
         // ARM EHABI personality routine.
-        // https://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf
+        // https://web.archive.org/web/20190728160938/https://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf
         //
         // iOS uses the default routine instead since it uses SjLj unwinding.
         #[lang = "eh_personality"]