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Performance regression due to absence of lto #2008

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@wds15

Description

@wds15

Description

The freshly merged static matrix refactor things do slow down stan programs significantly whenever lto is not turned on.

So as of now in the static matrix world we absolutely need the lto optimisation for good performance. Thus, our makefiles should ideally switch on lto whenever the compiler is capable enough of handling it. The user should not be required to add -flto to the make/local to get good performance

Example

See #2007 (comment)

where it is demonstrated that turning on lto gives back the old performance numbers.

Expected Output

Results should be produced as fast as in the pre static matrices.

Current Version:

v3.3.0

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