[llvm] [X86][CostModel] Estimate the codesize cost of switch (PR #163569)

[Hongyu Chen via llvm-commits]

XChy wrote:

> It looks like a lot of targets just unnecessarily implement this method, with an implementation that is equivalent to the default one.

The implementations of X86/AArch64/RISC-V are equivalent, but they differ slightly from the default implementation: the default implementation assumes a throughput cost of 1, rather than 0.


https://github.com/llvm/llvm-project/pull/163569