Use simple nested-if for laf-intel

tools/laf/laf.cpp

tools/laf/laf.hpp

tools/laf/test/test0.c

tools/laf/test/test_cmp_16.c

tools/laf/test/test_cmp_32_neg.c

tools/laf/test/test_cmp_64.c

tools/laf/test/test_cmp_64_neg.c

zipr_umbrella