Canonicalize const ifs

[annagrin]

Description

Canonicalize const ifs

Example:

    cc.if(%true) {
      %6 = quake.extract_ref %0[0] : (!quake.veq<2>) -> !quake.ref
      quake.x %6 : (!quake.ref) -> ()
    }

Should be converted to

      %6 = quake.extract_ref %0[0] : (!quake.veq<2>) -> !quake.ref
      quake.x %6 : (!quake.ref) -> ()

Update: this change affects too many tests. I am planning to just add the pattern in question to LoopUnroll for now in a next PR

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