[Orc] Honor hasJIT in JITTargetMachineBuilder::createTargetMachine

[ro]

Summary

Even with D129349, various SPARC JIT tests still FAIL. They are guarded by host-supports-jit. This is set from clang-repl --host-supports-jit which still returns true. It turns out the JITTargetMachineBuilder doesn't consider hasJIT at all.

This patch corrects this, turning the affected tests UNSUPPORTED.

Tested on sparcv9-sun-solaris2.11.

[lhames]

LGTM. Thanks @ro!

llvm/lib/ExecutionEngine/Orc/JITTargetMachineBuilder.cpp

 Expected<std::unique_ptr<TargetMachine>>
 JITTargetMachineBuilder::createTargetMachine() {
 
   std::string ErrMsg;
   auto *TheTarget = TargetRegistry::lookupTarget(TT.getTriple(), ErrMsg);
   if (!TheTarget)
     return make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode());
 
+  if (!TheTarget->hasJIT())
+    return make_error<StringError>("Target has no JIT support",
+                                   inconvertibleErrorCode());
+
   auto *TM =
       TheTarget->createTargetMachine(TT.getTriple(), CPU, Features.getString(),
                                      Options, RM, CM, OptLevel, /*JIT*/ true);
   if (!TM)
     return make_error<StringError>("Could not allocate target machine",
                                    inconvertibleErrorCode());
 
   return std::unique_ptr<TargetMachine>(TM);