add clock_gettime in src/libtiming.c
add clock_gettime(testing)
combine rdtsc and clock_gettime(testing)
add test-fadd.c to test fadd(still working)
Merge branch 'master' of https://github.com/xiehuc/llvm-pred
fix time bugs(not done)

Signed-off-by: xiehuc <xiehuc@gmail.com>
Merge pull request #5 from LGZ-T/master

fix some bug