Better occurrence analysis with casts

This patch addresses #20988 by refactoring the way the
occurrence analyser deals with lambdas.

Previously it used collectBinders to split off a group of binders,
and deal with them together.  Now I deal with them one at a time
in occAnalLam, which allows me to skip casts easily.  See
    Note [Occurrence analysis for lambda binders]
about "lambda-groups"

This avoidance of splitting out a list of binders has some good
consequences.  Less code, more efficient, and I think, more clear.

The Simplifier needed a similar change, now that lambda-groups
can inlude casts.  It turned out that I could simplify the code
here too, in particular elminating the sm_bndrs field of StrictBind.
Simpler, more efficient.

Compile-time metrics improve slightly; here are the ones that are
+/- 0.5% or greater:

                                  Baseline
              Test    Metric         value     New value Change
--------------------------------------------------------------------
   T11303b(normal) ghc/alloc    40,736,702    40,543,992  -0.5%
    T12425(optasm) ghc/alloc    90,443,459    90,034,104  -0.5%
    T14683(normal) ghc/alloc 2,991,496,696 2,956,277,288  -1.2%
    T16875(normal) ghc/alloc    34,937,866    34,739,328  -0.6%
   T17977b(normal) ghc/alloc    37,908,550    37,709,096  -0.5%
    T20261(normal) ghc/alloc   621,154,237   618,312,480  -0.5%
     T3064(normal) ghc/alloc   190,832,320   189,952,312  -0.5%
     T3294(normal) ghc/alloc 1,604,674,178 1,604,608,264  -0.0%
   T5321FD(normal) ghc/alloc   270,540,489   251,888,480  -6.9% GOOD
  T5321Fun(normal) ghc/alloc   300,707,814   281,856,200  -6.3% GOOD
     WWRec(normal) ghc/alloc   588,460,916   585,536,400  -0.5%

         geo. mean                                        -0.3%

Metric Decrease:
    T5321FD
    T5321Fun

0 files changed, 0 insertions, 0 deletions