[llvm] [LVI][SCCP] Add basic ConstantFPRange support (PR #111544)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> > Can you please check the memory usage impact? I believe this increases the size of the lattice values by another two words, and IIRC both IPSCCP and LVI can be memory usage sensitive.
> 
> I just pushed a new branch perf/lvi-cfr.

Compile-time impact:

instructions: http://llvm-compile-time-tracker.com/compare.php?from=a3a253d3c7780977077dd46493917b1949c0166d&to=553fdd7a60c0fc4cf379f284bc226ea427489cbd&stat=instructions:u

memory usage: http://llvm-compile-time-tracker.com/compare.php?from=a3a253d3c7780977077dd46493917b1949c0166d&to=553fdd7a60c0fc4cf379f284bc226ea427489cbd&stat=max-rss

https://github.com/llvm/llvm-project/pull/111544