[llvm] [InlineCost] Correct the default branch cost for the switch statement (PR #85160)

[Craig Topper via llvm-commits]

topperc wrote:

> But I don't know why it's 4 * InstrCost and not 3 * InstrCost.

On most targets other than X86 load+jump is 2 instructions.

https://github.com/llvm/llvm-project/pull/85160