[clangd] Fix use-after-scope in unit test
[clangd] Fix use-after-scope in unit test

The scheduler holds a reference to `Proceed`, so it has to be destroyed
after the scheduler. Found by asan.

git-svn-id: a34e9779ed74578ad5922b3306b3d80a0c825546@347460 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra,llvm-mirror/clang-tools-extra