Bug 1554286 - move Mac builds to Rust 1.36-beta; r=chmanchester

We would like to switch to using cross-language LTO on all of our
platforms, and we need to use a beta version of Rust on Mac to do that.

Differential Revision: https://phabricator.services.mozilla.com/D33316

--HG--
extra : moz-landing-system : lando

taskcluster/ci/toolchain/dist-toolchains.yml

@@ -35,5 +35,5 @@ rustc-dist-toolchain:
         arguments: ['rustc']
         toolchain-artifact: public/build/rustc-dist-toolchain.tar.xz
     toolchains:
-        - linux64-rust-macos-1.35
+        - linux64-rust-macos-1.36
         - linux64-sccache

taskcluster/ci/toolchain/rust.yml

@@ -120,13 +120,13 @@ linux64-rust-macos-1.34:
             '--target', 'x86_64-apple-darwin',
         ]
 
-linux64-rust-macos-1.35:
+linux64-rust-macos-1.36:
     description: "rust repack with macos-cross support"
     treeherder:
         symbol: TL(rust-macos)
     run:
         arguments: [
-            '--channel', '1.35.0',
+            '--channel', 'beta-2019-05-30',
             '--host', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-unknown-linux-gnu',
             '--target', 'x86_64-apple-darwin',

toolkit/library/rust/shared/build.rs

@@ -5,7 +5,7 @@ use rustc_version::{version, Version};
 fn main() {
     let ver = version().unwrap();
     let mut bootstrap = false;
-    let max_oom_hook_version = Version::parse("1.36.0-alpha").unwrap();
+    let max_oom_hook_version = Version::parse("1.37.0-alpha").unwrap();
 
     if ver >= Version::parse("1.28.0-alpha").unwrap() && ver < max_oom_hook_version {
         println!("cargo:rustc-cfg=feature=\"oom_with_hook\"");