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[vectorizer] Fix a trivial oversight where we always requested the number of…

Authored by chandlerc on Jan 27 2014, 3:12 AM.

Description

[vectorizer] Fix a trivial oversight where we always requested the number of vector registers rather than toggling between vector and scalar register number based on VF. I don't have a test case as I spotted this by inspection and on X86 it only makes a difference if your target is lacking SSE and thus has *no* vector registers.

If someone wants to add a test case for this for ARM or somewhere else
where this is more significant, that would be awesome.

Also made the variable name a bit more sensible while I'm here.

llvm-svn: 200211

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