Revert "[ORC] Switch to asynchronous resolution in JITSymbolResolver."

This reverts commit r342939.

MSVC's promise/future implementation does not like types that are not default
constructible. Reverting while I figure out a solution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342941 91177308-0d34-0410-b5e6-96231b3b80d8
10 files changed