Rollup merge of rust-lang#36796 - TimNN:mips64-data-layout, r=japaric

update mips64* data-layout

I tried to compile some (`#![no_core]`) code for the `mips64` targets on the latest nightly and got ICE's about mismatched data layouts. I updated the data layouts to match the listed llvm defaults.

cc @japaric

Funnily enough, this seems to be the exact reverse of what @japaric did in 2222d43 as part of rust-lang#36024.

Author: Jonathan Turner

src/librustc_back/target/mips64_unknown_linux_gnuabi64.rs

@@ -15,7 +15,7 @@ pub fn target() -> TargetResult {
         llvm_target: "mips64-unknown-linux-gnuabi64".to_string(),
         target_endian: "big".to_string(),
         target_pointer_width: "64".to_string(),
-        data_layout: "E-m:m-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
+        data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
         target_os: "linux".to_string(),
         target_env: "gnu".to_string(),

src/librustc_back/target/mips64el_unknown_linux_gnuabi64.rs

@@ -15,7 +15,7 @@ pub fn target() -> TargetResult {
         llvm_target: "mips64el-unknown-linux-gnuabi64".to_string(),
         target_endian: "little".to_string(),
         target_pointer_width: "64".to_string(),
-        data_layout: "e-m:m-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
+        data_layout: "e-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
         arch: "mips64".to_string(),
         target_os: "linux".to_string(),
         target_env: "gnu".to_string(),