Bug 1727088 - Add `wasi-compiler-rt` to `clang-10` artifact. r=firefox-build-system-reviewers,glandium

Unfortunately we cannot move coverity builds to newer versions of clang so we are stick to clang-10.

Differential Revision: https://phabricator.services.mozilla.com/D123370

build/build-clang/clang-10-linux64.json

@@ -3,6 +3,7 @@
     "pgo" : true,
     "build_libcxx": true,
     "build_wasm": true,
+    "wasi-compiler-rt": "{MOZ_FETCHES_DIR}/compiler-rt",
     "build_type": "Release",
     "assertions": false,
     "cc": "{MOZ_FETCHES_DIR}/gcc/bin/gcc",

taskcluster/ci/toolchain/clang.yml

@@ -120,6 +120,7 @@ linux64-clang-10:
             - linux64-binutils
             - linux64-gcc-7
             - linux64-toolchain-sysroot
+            - wasm32-wasi-compiler-rt-10
 
 linux64-clang-11:
     description: "Clang 11 toolchain build"

taskcluster/ci/toolchain/compiler-rt.yml

@@ -119,3 +119,15 @@ wasm32-wasi-compiler-rt-12:
         fetch:
             - clang-12
             - wasi-sdk
+
+wasm32-wasi-compiler-rt-10:
+    description: "wasm32-wasi Compiler-rt for Clang 10 toolchain build"
+    treeherder:
+        symbol: TL(wasi-crt-10)
+    worker-type: b-linux-xlarge
+    run:
+        script: build-compiler-rt-wasi.sh
+    fetches:
+        fetch:
+            - clang-10
+            - wasi-sdk