Increase gc-cons-threshold during package-init?

[T.V Raman]

With Emacs now calling package-initialize on its own, I noticed (after
removing package-initialize from my emacs init file)
that emacs startup was now  entailing 3 times as many gc calls during
startup as before. One guess is that my init file was lexically
binding gc-cons-threshold to 64MB --- the default gc-cons-threshold
of 800K is likely from the past and could be increased. 

Even if we leave the default as is, it might make sense to temporarily
increase gc-cons-threshold within package-initialize 

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