Detect and use compiler auto-vectorization flags.

[ossama-othman]

Improve performance by making changes that provide more opportunities for the compiler to automatically vectorize code in MaRC, particularly loops.

Relevant references:

• What is SSE and AVX?
• Software optimization resources

[coveralls]

Pull Request Test Coverage Report for Build 555

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.671%

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Totals
Change from base Build 552:	0.0%
Covered Lines:	2679
Relevant Lines:	3091

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💛 - Coveralls