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

[Congcong Cai via llvm-commits]

HerrCai0907 wrote:

This is what aarch64 llc do, it also drop the all instruction after llvm.trap.
```
define void @foo(ptr %p) {
  %a = load i32, ptr %p
  call void @llvm.trap()
  %b = load i32, ptr %p
  ret void
}
```

```
foo:                                    // @foo
	.cfi_startproc
// %bb.0:
	brk	#0x1
	ret
```

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