On SPR, it improves sinh bench performance by:

			Before		After		Improvement
reciprocal-throughput	14.2017		11.815		17%
latency			36.4917		35.2114		4%

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

Add a full set of inputs for sinh and cosh functions generated using a
random number generator and spreading it over all branches in the
function, ignoring the fast paths (i.e. immediate return for special
values).

This patch adds some more directives to the benchmark inputs file,
moving functionality from the Makefile and making the code generation
script a bit cleaner.  The function argument and return types that
were earlier added as variables in the makefile and passed to the
script via command line arguments are now the 'args' and 'ret'
directive respectively.  'args' should be a colon separated list of
argument types (skipped if the function doesn't accept any arguments)
and 'ret' should be the return type.

Additionally, an 'includes' directive may have a comma separated list
of headers to include in the source.  For example, the pow input file
now looks like this:

42.0, 42.0
1.0000000000000020, 1.5

I did this to unclutter the benchtests Makefile a bit and eventually
eliminate dependency of the tests on the Makefile and have tests
depend on their respective include files only.

Add benchmark inputs for inverse and hyperbolic trigonometric
functions and log.