fibonacci-gcc-results with unwinding

gcc.md

test	function size	execution time
cc-O0-no_unwind	242 bytes	181.44
cc-O0-unwind_dontcare	274 bytes	216.39
cc-O0-unwind_noexcept	230 bytes	215.46
cc-O0-unwind_throwing	353 bytes	215.35
cc-O0-unwind_catching	385 bytes	215.07
cc-O2-no_unwind	108 bytes	25.74
cc-O2-unwind_dontcare	132 bytes	26.05
cc-O2-unwind_noexcept	108 bytes	25.78
cc-O2-unwind_throwing	201 bytes	25.84
cc-O2-unwind_catching	223 bytes	25.77
cc-O3-no_unwind	1082 bytes	12.94
cc-O3-unwind_dontcare	865 bytes	13.41
cc-O3-unwind_noexcept	1082 bytes	13.24
cc-O3-unwind_throwing	710 bytes	14.64
cc-O3-unwind_catching	686 bytes	14.01