Feature update for intrin_dot_sample.cpp

[zjin-lcf]

Summary

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README says that "They provide access to instructions that cannot be generated using the standard constructs of the C and C++ languages, and allow code to leverage performance enhancing features unique to specific processors. "
May we use some SIMD compiler options to achieve vectorization ?

Problem statement

A comparison between the performance of using intrinsics and the performance of using SIMD compiler options

Preferred solution

Add a solution to the problem where the size is not a multiple of 8. Currently, it is 24.
Add a solution, if possible, to adding some SIMD compiler options to achieve vectorization

Thanks

[anjgola]

@ethanhirsch I think you are the author of this sample.

[JoeOster]

@ethanhirsch is working on this