The strategy here is to look at (data, padding) pairs and RLE
them into loops, so that repeated adjacent patterns use a loop
rather than getting unrolled. On the test case from #54109,
this makes compilation essentially instant, while also being
faster at runtime (turns out LLVM spends a massive amount of time
AND the answer is bad).

There's some obvious further enhancements possible here:
1. The `memcmp` constant is small. LLVM has a pass to inline these
   with better code. However, we don't have it turned on. We should
   consider vendoring it, though we may want to add some shorcutting
   to it to avoid having it iterate through each function.
2. This only does one level of sequence matching. It could be recursed
   to turn things into nested loops.

However, this solves the immediate issue, so hopefully it's a useful
start. Fixes #54109.