fix develop

[rok-cesnovar]

Summary

Fix for develop. PR #1628 that was merged last has removed fwd/fun/dot_product.hpp. However PR #1698 added an include to that file. PR #1698 was merged after the tests in #1628 passed and there was no conflict that would require an additional merge and tests. Hence this PR.

Tests

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Side Effects

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Checklist

• Copyright holder: Rok Češnovar

  The copyright holder is typically you or your assignee, such as a university or company. By submitting this pull request, the copyright holder is agreeing to the license the submitted work under the following licenses:
  - Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)
  - Documentation: CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

• the basic tests are passing

  • unit tests pass (to run, use: ./runTests.py test/unit)
  • header checks pass, (make test-headers)
  • dependencies checks pass, (make test-math-dependencies)
  • docs build, (make doxygen)
  • code passes the built in C++ standards checks (make cpplint)

• the code is written in idiomatic C++ and changes are documented in the doxygen

• the new changes are tested

[stan-buildbot]

---

Name	Old Result	New Result	Ratio	Performance change( 1 - new / old )
gp_pois_regr/gp_pois_regr.stan	4.98	4.97	1.0	0.25% faster
low_dim_corr_gauss/low_dim_corr_gauss.stan	0.02	0.02	0.98	-2.26% slower
eight_schools/eight_schools.stan	0.09	0.09	1.01	0.95% faster
gp_regr/gp_regr.stan	0.22	0.22	0.99	-1.44% slower
irt_2pl/irt_2pl.stan	6.06	6.08	1.0	-0.4% slower
performance.compilation	88.01	86.95	1.01	1.21% faster
low_dim_gauss_mix_collapse/low_dim_gauss_mix_collapse.stan	7.49	7.46	1.0	0.31% faster
pkpd/one_comp_mm_elim_abs.stan	21.1	21.28	0.99	-0.85% slower
sir/sir.stan	97.82	89.78	1.09	8.22% faster
gp_regr/gen_gp_data.stan	0.04	0.05	0.99	-0.8% slower
low_dim_gauss_mix/low_dim_gauss_mix.stan	3.01	2.99	1.01	0.61% faster
pkpd/sim_one_comp_mm_elim_abs.stan	0.31	0.34	0.94	-6.61% slower
arK/arK.stan	1.75	1.74	1.01	0.66% faster
arma/arma.stan	0.77	0.8	0.97	-3.32% slower
garch/garch.stan	0.58	0.59	0.99	-0.79% slower
Mean result: 0.998068898787

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Jenkins Console Log
Blue Ocean
Commit hash: 0034f24

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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