Revert "Fix the build broken as a result of deleting jit from LLVM."

jit was re-added back to LLVM, so now we require to link against it
again.  Should it get removed again, then revert this revert.

llvm-svn: 215170
diff --git a/lldb/source/Expression/IRExecutionUnit.cpp b/lldb/source/Expression/IRExecutionUnit.cpp
index fb8ea1a..7695608 100644
--- a/lldb/source/Expression/IRExecutionUnit.cpp
+++ b/lldb/source/Expression/IRExecutionUnit.cpp
@@ -302,7 +302,9 @@
     .setRelocationModel(relocModel)
     .setJITMemoryManager(new MemoryManager(*this))
     .setOptLevel(llvm::CodeGenOpt::Less)
-    .setCodeModel(codeModel);
+    .setAllocateGVsWithCode(true)
+    .setCodeModel(codeModel)
+    .setUseMCJIT(true);
 
     llvm::StringRef mArch;
     llvm::StringRef mCPU;