Refactoring: explicitly mark whether we have an info table in RawCmm
I introduced this to support explicitly recording the info table label in RawCmm for another patch I am working on, but it turned out to lead to significant simplification in those parts of the compiler that consume RawCmm. Now, instead of lots of tests for null [CmmStatic] we have a simple test of a Maybe, and have reduced the number of guys that need to know how to convert entry->info labels by a TON. There are only 3 callers of that function now!
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