[AArch64][SVE] Lower unpredicated loads/stores as LDR/STR. (#127837)

Currently, given:
```cpp
svuint8_t foo(uint8_t *x) {
  return svld1(svptrue_b8(), x);
}
```
We generate:
```gas
foo:
  ptrue   p0.b
  ld1b    { z0.b }, p0/z, [x0]
  ret
```
However, on little-endian and with unaligned memory accesses allowed, we
could instead be using LDR as follows:
```gas
foo:
  ldr     z0, [x0]
  ret
```

The second form avoids the predicate dependency.
Likewise for other types and stores.

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