Move the SMT API to LLVM

Moved everything SMT-related to LLVM and updated the cmake scripts.

Differential Revision: https://reviews.llvm.org/D54978

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@353373 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed