OpenCL: rev support for trigonometric functions

[rok-cesnovar]

Summary

This PR adds /rev OpenCL support for acos, acosh, asin, asinh, atan, atanh, cos, cosh, sin, sinh, tan, tanh

Tests

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Side Effects

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Release notes

OpenCL: added /rev support for acos, acosh, asin, asinh, atan, atanh, cos, cosh, tan, tanh

Checklist

• Math issue Implement matrix_cl overloads for prim & rev functions #1854

• Copyright holder: Rok Češnovar, Uni. of Ljubljana

[t4c1]

No need for eval.

Suggested change

	auto acos_functor = [](const auto& a) { return stan::math::acos(a).eval(); };
	auto acos_functor = [](const auto& a) { return stan::math::acos(a); };

[t4c1]

Same for other tests.

[rok-cesnovar]

Done.

[stan-buildbot]

---

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_pois_regr/gp_pois_regr.stan	3.41	3.47	0.98	-1.74% slower
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.02	0.02	1.01	0.98% faster
eight_schools/eight_schools.stan	0.11	0.11	0.96	-4.68% slower
gp_regr/gp_regr.stan	0.15	0.16	0.98	-1.66% slower
irt_2pl/irt_2pl.stan	5.41	5.43	1.0	-0.46% slower
performance.compilation	89.54	88.03	1.02	1.68% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	8.41	8.45	1.0	-0.41% slower
pkpd/one_comp_mm_elim_abs.stan	29.39	29.82	0.99	-1.47% slower
sir/sir.stan	138.77	136.2	1.02	1.85% faster
gp_regr/gen_gp_data.stan	0.05	0.04	1.01	1.12% faster
low_dim_gauss_mix/low_dim_gauss_mix.stan	2.96	2.92	1.02	1.51% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.41	0.4	1.02	1.74% faster
arK/arK.stan	2.48	2.46	1.01	0.76% faster
arma/arma.stan	0.89	0.89	1.0	0.11% faster
garch/garch.stan	0.53	0.54	0.99	-1.08% slower
Mean result: 0.999123075781

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Jenkins Console Log
Blue Ocean
Commit hash: 74d64ef

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Machine information

ProductName: Mac OS X ProductVersion: 10.11.6 BuildVersion: 15G22010

CPU:
Intel(R) Xeon(R) CPU E5-1680 v2 @ 3.00GHz

G++:
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

Clang:
Apple LLVM version 7.0.2 (clang-700.1.81)
Target: x86_64-apple-darwin15.6.0
Thread model: posix