[llvm] [WebAssembly] Fix missed optimization in 50142 (PR #144741)

[via llvm-commits]

badumbatish wrote:

i updated the code, in the case of 4xi16, the fold doesn't work since i was targeting setcc
```
define i32 @all_true_4_i16(<4 x i16> %v) {
; CHECK-LABEL: all_true_4_i16:
; CHECK:         .functype all_true_4_i16 (v128) -> (i32)
; CHECK-NEXT:  # %bb.0:
; CHECK-NEXT:    v128.const $push0=, 0, 0, 0, 0, 0, 0, 0, 0
; CHECK-NEXT:    i16x8.eq $push1=, $0, $pop0
; CHECK-NEXT:    i32x4.extend_low_i16x8_s $push2=, $pop1
; CHECK-NEXT:    v128.any_true $push3=, $pop2
; CHECK-NEXT:    i32.const $push4=, -1
; CHECK-NEXT:    i32.xor $push5=, $pop3, $pop4
; CHECK-NEXT:    i32.const $push6=, 1
; CHECK-NEXT:    i32.and $push7=, $pop5, $pop6
; CHECK-NEXT:    return $pop7
  %1 = icmp eq <4 x i16> %v, zeroinitializer
  %2 = bitcast <4 x i1> %1 to i4
  %3 = icmp eq i4 %2, 0
  %conv3 = zext i1 %3 to i32
  ret i32 %conv3
}
```

https://github.com/llvm/llvm-project/pull/144741