message: Remove idiv failures from fail_db
diff: ./tests/shuffle2-12.ispc runfail genx64 genx-x8 unspec Linux LLVM 12.0 clang++12.0 spv *
  ./tests/shuffle2-12.ispc runfail genx64 genx-x16 TGLLP Linux LLVM 12.0 clang++12.0 spv *
  ./tests/shuffle2-12.ispc runfail genx64 genx-x16 unspec Linux LLVM 12.0 clang++12.0 spv *
  -.\tests\idiv-int16.ispc runfail genx64 genx-x8 TGLLP Windows LLVM 12.0 cl spv *
  -.\tests\idiv-int32.ispc runfail genx64 genx-x8 TGLLP Windows LLVM 12.0 cl spv *
  .\tests\shuffle2-12.ispc runfail genx64 genx-x8 TGLLP Windows LLVM 12.0 cl spv *
  .\tests\shuffle2-12.ispc runfail genx64 genx-x8 unspec Windows LLVM 12.0 cl spv *
  -.\tests\idiv-int16.ispc runfail genx64 genx-x16 TGLLP Windows LLVM 12.0 cl spv *
  -.\tests\idiv-int32.ispc runfail genx64 genx-x16 TGLLP Windows LLVM 12.0 cl spv *
  .\tests\shuffle2-12.ispc runfail genx64 genx-x16 TGLLP Windows LLVM 12.0 cl spv *
  .\tests\shuffle2-12.ispc runfail genx64 genx-x16 unspec Windows LLVM 12.0 cl spv *
  