Make profilings optional

[vgene]

Make LAMP and SpecPriv optional

• LAMP
• SpecPriv

[gchan510]

Added option -lamp-ignore to ignore LAMP profile or to indicate that it doesn't exist in f7d44ab
Querying LAMPLoadProfile for number of deps with this option enabled conservatively returns UINT_MAX.

TODOs:

• Merge LAMP and LAMPLoad into one library (contains identical versions of same pass in each)
• SpecPriv optional

QUESTIONS:

• Why is LAMP run twice in our pipeline?
• SmtxAA is the only pass that uses LAMP directly? Maybe it should be renamed and moved to SCAF at some point.

[sapostolakis]

I use LAMP results in the aggressive inliner. And then it needs to run again for the post-inlining code.