[llvm] [SystemZ] Fix compile time regression in adjustInliningThreshold(). (PR #137527)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

@nikic thanks for review! I followed your suggestions and indeed see a further speedup: zig.bc is now regressing <0.5% with this heuristic (compared to removing it), so nearly gone. And average over SPEC for InlinerPass is now 2% better than with main (1.46% vs 1.49%).


https://github.com/llvm/llvm-project/pull/137527