Rollup merge of #96415 - ehuss:git-io, r=bjorn3

Remove references to git.io

The git.io service is shutting down soon (see https://github.blog/changelog/2022-04-25-git-io-deprecation/). This removes the references of those short links with the actual destination.

compiler/rustc_target/src/asm/mips.rs

@@ -43,7 +43,8 @@ impl MipsInlineAsmRegClass {
     }
 }
 
-// The reserved registers are somewhat taken from <https://git.io/JUR1k#L150>.
+// The reserved registers are somewhat taken from
+// <https://github.com/llvm/llvm-project/blob/deb8f8bcf31540c657716ea5242183b0792702a1/llvm/lib/Target/Mips/MipsRegisterInfo.cpp#L150>.
 def_regs! {
     Mips MipsInlineAsmReg MipsInlineAsmRegClass {
         r2: reg = ["$2"],

library/std/src/sys/unix/process/process_common.rs

@@ -35,7 +35,8 @@ cfg_if::cfg_if! {
 // Android with api less than 21 define sig* functions inline, so it is not
 // available for dynamic link. Implementing sigemptyset and sigaddset allow us
 // to support older Android version (independent of libc version).
-// The following implementations are based on https://git.io/vSkNf
+// The following implementations are based on
+// https://github.com/aosp-mirror/platform_bionic/blob/ad8dcd6023294b646e5a8288c0ed431b0845da49/libc/include/android/legacy_signal_inlines.h
 cfg_if::cfg_if! {
     if #[cfg(target_os = "android")] {
         pub unsafe fn sigemptyset(set: *mut libc::sigset_t) -> libc::c_int {