[llvm] r178221 - Disable JIT/MCJIT tests in unittests/ExecutionEngine for the targets that don't support JIT.

[Jyotsna Verma]

>It seems this disabled JIT/MCJIT unit tests on *all* platforms when using
>make: the TARGET_HAS_JIT macro is defined by the $(LEVEL)/Makefile.config
>fragment, which is included
>*after* the macro is attempted to be used, so the ifeq will always evaluate
to
>false ...

I guess there is a problem. As you pointed out, the TARGET_HAS_JIT macro
should be checked after Makefile.config has been included. I will take care
of it. 
However, while looking at the llvm buildbot result for make check-all, I
found these tests running for some of the x86 configuration:
http://lab.llvm.org:8011/builders/clang-x86_64-debian/builds/6315/steps/chec
k-all/logs/stdio. 

Thanks,
Jyotsna