A question about Word32PairShr on arm

[Yahan Lu]

On the arm, before Word32PairShr, v8 outputs Word32And arg 63.

```

 #19:Word32And(#4:Parameter, #17:Int32Constant) [type: Wasm:i32] #11:Word32PairShr(#3:Parameter, #15:Parameter, #19:Word32And) [type: Wasm:i64] #21:Projection[0](#11:Word32PairShr, #0:Start) [Type: Wasm:i32] 

#22:Projection[1](#11:Word32PairShr, #0:Start) [Type: Wasm:i32] 

```

But on riscv , it don't emit Word32And.

```

#4:Parameter[3](#0:Start)  [Type: Wasm:i32]
#9:Word32PairShr(#3:Parameter, #13:Parameter, #4:Parameter)  [Type: Wasm:i64]
#15:Projection[0](#9:Word32PairShr, #0:Start)  [Type: Wasm:i32]
#16:Projection[1](#9:Word32PairShr, #0:Start)  [Type: Wasm:i32]

```

Is there flag to control this behavior?

cmd :

out/arm.release/d8 --test test/wasm-spec-tests/tests/i64.js --random-seed=-989691571 --nohard-abort --testing-d8-test-runner --stress-opt --no-liftoff --stress-lazy-source-positions --no-wasm-generic-wrapper  --print-wasm-code --code-comments --trace-turbo --trace-turbo-graph

[Clemens Backes]

On some platforms we need to mask the shift amount to make sure that it's within [0,31]. Other platforms don't care, and do this masking implicitly.

See https://source.chromium.org/chromium/chromium/src/+/main:v8/src/compiler/wasm-compiler.cc;l=1212;drc=06106fa71f3ed1044028f77ccf4d5b9de7028b8b.

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Clemens Backes

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