[llvm] [Transforms] Resolve FIXME: Pick the smallest legal type that fits (PR #79158)

[Arthur Eubanks via llvm-commits]

================
@@ -1,16 +1,29 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -passes='float2int' -S | FileCheck %s
+; RUN: opt < %s -passes='float2int' -S | FileCheck %s -check-prefixes=CHECK,NONE
----------------
aeubanks wrote:

nit: `-passes=float2int` is a tiny bit nicer

https://github.com/llvm/llvm-project/pull/79158