ISPC recommends building LLVM 12 with some additional patches to work
around some bugs in this version. Add those patches to our build as well.
https://github.com/ispc/ispc/tree/v1.16.1/llvm_patches
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
