[llvm] [FuncSpec] Consider literal constants of recursive functions (PR #111162)

[Hari Limaye via llvm-commits]

hazzlim wrote:

This change is intended to prevent regressions in code which would otherwise be negatively affected by https://github.com/llvm/llvm-project/pull/111163.

This change has negligible impact on CTMark compile times (Geomean 0.00%) for both LTO and non-LTO pipelines.

https://github.com/llvm/llvm-project/pull/111162