Fixed issues/improvements:

• IGC now links with LLVM10,
• Emulation of 64-bit subgroup arithmetic and clustered non-uniform functions for platforms not supporting 64-it type natively,
• Fixes to cl_khr_subgroup_shuffle_relative and cl_khr_subgroup_clustered_reduce,
• Skip prefixes when parsing build options,
• Indirect address access is not allowed when dst is accumulator,
• Fix for SubgroupLtMask,
• Using local fences for local atomics,
• Fix sub_group_shuffle_down for long and double,
• Fix local block read builtins,
• Other fixes and improvements.

Ubuntu 18.04 binary packages for LLVM10/Clang10 are included.