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

[Derek Schuff via llvm-commits]

dschuff wrote:

Yeah, it does seem like it could go either way. In fact there is also `llvm.debugtrap` which is not marked as noreturn, so we can't lower it to actual wasm `unreachable`, so we have a pseudoinstruction instead: https://github.com/llvm/llvm-project/blob/d9fd0ddef38bb9d5cce7300ff820272183c09fcd/llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td#L113

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