Switch the default for building GlobalISel.

Now, GlobalISel will be built by default. To turn that off, one has to
use -DLLVM_BUILD_GLOBAL_ISEL=OFF on the cmake command line.

<rdar://problem/30004433>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293232 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed