[llvm] [Pipelines] Move IPSCCP after inliner pipeline (PR #96620)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

This patch causes some significant performance regressions on llvm-test-suite (rv64gc-O3-thinlto):
Name | Before | After | Ratio
-- | -- | -- | --
SingleSource/Benchmarks/Shootout/Shootout-random | 2.150161677 | 3.300161641 | + 53.5%
SingleSource/Benchmarks/Polybench/linear-algebra/kernels/trisolv/trisolv  | 0.111845159 | 0.145389494 | +30.0%
SingleSource/Benchmarks/Adobe-C++/functionobjects | 5.489498263 | 6.827863965 | +24.4%



https://github.com/llvm/llvm-project/pull/96620