[lldb] [llvm] Add AArch64 support to the premerge tests (PR #155274)

[Aiden Grossman via llvm-commits]

================
@@ -54,11 +77,14 @@ jobs:
           export CC=/opt/llvm/bin/clang
           export CXX=/opt/llvm/bin/clang++
 
-          # This environment variable is passes into the container through the
-          # runner pod definition. This differs between our two clusters which
-          # why we do not hardcode it.
-          export SCCACHE_GCS_BUCKET=$CACHE_GCS_BUCKET
-          export SCCACHE_GCS_RW_MODE=READ_WRITE
+          if [[ "${{ matrix.runs-on }}" = "llvm-premerge-linux-runners" ]]; then
----------------
boomanaiden154 wrote:

Make a note that this is conditional due to the different caching setup between GCP and AWS/depot?

https://github.com/llvm/llvm-project/pull/155274