[Metal] Synchronize managed resources in Metal backend#997

kcloudy0717 wants to merge 3 commits intollvm:mainllvm/offload-test-suite:mainfrom

kcloudy0717:kcloudy0717/metal/SynchronizeResourcekcloudy0717/offload-test-suite:kcloudy0717/metal/SynchronizeResourceCopy head branch name to clipboard