[mips/mips64: msa] add add_a_b intrinsic (#365)

* [mips64/msa] add add_a_b intrinsic

* add make/file to mips64el's Dockerfile

* add run-time detection support for mips64

* add mips64 build bot

* generate docs for mips64

* fix linux test

* cleanup rt-detection

* support mips64/mips64el in stdsimd-test

* support asserting instructions with  in their name

* better error msgs for the auxv_crate test

* debug auxv on mips64

* override run-time detection on mips msa tests

* remove unused #[macro_use]

* try another MIPS cpu

* detect default TARGET in simd-test-macro

* use mips64r2-generic

* disable unused function in mips tests

* move msa to mips

* remove mips from ci

* split into mips and mips64 modules

* add rt-detection for 32-bit mips

* fmt

* remove merge error

* add norun build bots for mips

* add -p to avoid changing the cwd

* fixup

* refactor run-time detection module

1 files changed, 13 insertions, 5 deletions

diff --git a/library/stdarch/crates/assert-instr-macro/src/lib.rs b/library/stdarch/crates/assert-instr-macro/src/lib.rs
index 24b0e888cf6..5066d0bbcd4 100644
--- a/library/stdarch/crates/assert-instr-macro/src/lib.rs
+++ b/library/stdarch/crates/assert-instr-macro/src/lib.rs
@@ -39,8 +39,15 @@ pub fn assert_instr(
         (quote! { #[ignore] }).into()
     };
     let name = &func.ident;
+    use quote::ToTokens;
+    let instr_str = instr
+        .clone()
+        .into_tokens()
+        .to_string()
+        .replace('.', "_")
+        .replace(|c: char| c.is_whitespace(), "");
     let assert_name = syn::Ident::from(
-        &format!("assert_{}_{}", name.as_ref(), instr.as_ref())[..],
+        &format!("assert_{}_{}", name.as_ref(), instr_str)[..],
     );
     let shim_name = syn::Ident::from(format!("{}_shim", name.as_ref()));
     let mut inputs = Vec::new();
@@ -72,7 +79,7 @@ pub fn assert_instr(
             attr.path
                 .segments
                 .first()
-                .unwrap()
+                .expect("attr.path.segments.first() failed")
                 .value()
                 .ident
                 .as_ref()
@@ -109,7 +116,8 @@ pub fn assert_instr(
         }
     }.into();
     // why? necessary now to get tests to work?
-    let tts: TokenStream = tts.to_string().parse().unwrap();
+    let tts: TokenStream =
+        tts.to_string().parse().expect("cannot parse tokenstream");
 
     let tts: TokenStream = quote! {
         #item
@@ -119,13 +127,13 @@ pub fn assert_instr(
 }
 
 struct Invoc {
-    instr: syn::Ident,
+    instr: syn::Expr,
     args: Vec<(syn::Ident, syn::Expr)>,
 }
 
 impl syn::synom::Synom for Invoc {
     named!(parse -> Self, map!(parens!(do_parse!(
-        instr: syn!(syn::Ident) >>
+        instr: syn!(syn::Expr) >>
         args: many0!(do_parse!(
             syn!(syn::token::Comma) >>
             name: syn!(syn::Ident) >>