tangaac dedf014901
[LoongArch] lower SCALAR_TO_VECTOR to INSERT_VECTOR_ELT (#122863)
```llvm
define <16 x i8> @scalar_to_16xi8(i8 %val) {
  %ret = insertelement <16 x i8> undef, i8 %val, i32 0
  ret <16 x i8> %ret
}
```

before
```asm
addi.d	$sp, $sp, -16
st.b	$a0, $sp, 0
vld	$vr0, $sp, 0
addi.d	$sp, $sp, 16
ret
```

after
```asm
vinsgr2vr.b $vr0, $a0, 0
ret
```

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Co-authored-by: Lu Weining <luweining@loongson.cn>
2025-01-22 17:27:52 +08:00
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