AArch64: adjust tests which rely on a default JIT

Profiling tests *do* need a JIT. They'll pass if a cross-compiler targetting
AArch64 by default has been built, but fail if a native AArch64 compiler has
been build. Therefore XFAIL is inappropriate and we mark them unsupported.

ExecutionEngine tests are JIT by definition, they should also be unsupported.

Transforms/LICM only uses the interpreter to check the output is still sane
after optimisation. It can be switched to use an interpreter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175433 91177308-0d34-0410-b5e6-96231b3b80d8
Note minimum required version of CMake

We already use features from 2.8.6, this just gives a slightly more friendly
message when the dependency isn't met.

Patch from Keith Walker.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175434 91177308-0d34-0410-b5e6-96231b3b80d8
Revert CMake version bump since we don't actually need 2.8.6 any more.

The problem call was removed in the interim. Apologies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175435 91177308-0d34-0410-b5e6-96231b3b80d8