[compiler-rt] Create a combined compiler-rt builtin bitcode for SPIRV64 target (#214149) This PR re-lands the compiler-rt builtin part from https://github.com/llvm/llvm-project/pull/196656 Signed-off-by: jinge90 <ge.jin@intel.com> GitOrigin-RevId: f6eb7c5ca11aa0d6c2463f0e7c83171362e16fd9