[llvm] [memprof] Use std::vector<Frame> instead of llvm::SmallVector<Frame> (NFC) (PR #94432)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

> Consider `SmallVector<Frame, 0>`? `sizeof(SmallVector<X, 0>) < sizeof(vector<X>)`

That's super interesting.  Thanks!  I just tried `SmallVector<Frame, 0>`.  The cycle count goes _up_ by 2.3% while the instruction goes down slightly by 0.09% (all relative to `SmallVector<Frame>`).  My `llvm-profdata` is not built with ThinLTO, so maybe a certain call hierarchy is not collapsed!?


https://github.com/llvm/llvm-project/pull/94432