[llvm] [WebAssembly] remove instruction after builtin trap (PR #90207)

[Sam Clegg via llvm-commits]

sbc100 wrote:

I'm not sure it true that `Instruction after terminator will cause validation failure`.   IIUC the WebAssembly validator has a special mode for instruction that follow unreachable, but its not necessarily a validation failure.   @tlively can correct me if I'm wrong.

https://github.com/llvm/llvm-project/pull/90207