[lli] Don't create an ExecutorProcessControl in non-remote MCJIT config.

When lli is run with -jit-kind=mcjit and without remote JITing there is no need
to create an ExecutorProcessControl object.

This is nice cleanup, but as a bonus should silence the leak reports that we're
seeing in https://green.lab.llvm.org/green/job/clang-stage2-cmake-RgSan/9105/.
(Though as a side note I believe those reports are spurious. They are being
tracked by rdar://104825696).

llvm/tools/lli/lli.cpp

@@ -663,10 +663,6 @@ int main(int argc, char **argv, char * const *envp) {
 #endif
   }
 
-  std::unique_ptr<orc::ExecutorProcessControl> EPC =
-      RemoteMCJIT ? ExitOnErr(launchRemote())
-                  : ExitOnErr(orc::SelfExecutorProcessControl::Create());
-
   if (!RemoteMCJIT) {
     // If the program doesn't explicitly call exit, we will need the Exit
     // function later on to make an explicit call, so get the function now.
@@ -712,6 +708,7 @@ int main(int argc, char **argv, char * const *envp) {
     abort();
   } else {
     // else == "if (RemoteMCJIT)"
+    std::unique_ptr<orc::ExecutorProcessControl> EPC = ExitOnErr(launchRemote());
 
     // Remote target MCJIT doesn't (yet) support static constructors. No reason
     // it couldn't. This is a limitation of the LLI implementation, not the