Fix operand order in v128_select_ssss

[shumbo]

This PR fixes a miscompilation in SIMD v128.select.

v128_select_ssss is executed with operands in the order (result, condition, true_val, false_val), but the translator currently emits (result, condition, false_val, true_val) when lowering v128.select. This causes the instruction to select the opposite branch.

Other select variants, including u32_select_* and u64_select_*, already use the correct operand order, so the issue is specific to the v128 lowering path.

Regression test:

(module
  (func (export "v128_select") (param i32) (result v128)
    (select (result v128)
      (v128.const i64x2 0x1111111111111111 0x2222222222222222)
      (v128.const i64x2 0x3333333333333333 0x4444444444444444)
      (local.get 0)
    )
  )
)
(assert_return (invoke "v128_select" (i32.const 1)) (v128.const i64x2 0x1111111111111111 0x2222222222222222))
(assert_return (invoke "v128_select" (i32.const 0)) (v128.const i64x2 0x3333333333333333 0x4444444444444444))

$ git rev-parse HEAD
9f6ff82fc11baea9a3c1232e13f2304fdc49d432
$ cargo run --bin wasmi --features simd -- wast test.wast
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
     Running `target/debug/wasmi wast test.wast`
Error: failed directive on test.wast:10:1

Caused by:
    0: evaluation mismatch of `v128` values
    1: expected = [1229782938247303441, 2459565876494606882], actual = [3689348814741910323, 4919131752989213764]

The test passes with this patch.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.37%. Comparing base (9f6ff82) to head (00f8dc9).

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/translator/func/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1834   +/-   ##
=======================================
  Coverage   73.37%   73.37%           
=======================================
  Files         175      175           
  Lines       14274    14274           
=======================================
  Hits        10473    10473           
  Misses       3801     3801           

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[Robbepop]

@shumbo thank you a lot for the bug fix and especially for the additional regression test!

[Robbepop]

The audit CI job is failing for reasons not associated to this PR's changes.