[AArch64][GlobalISel] Allow vector store legalization into 128-bit-wide types

We are allowed to store 128-bit-wide values using the q registers on AArch64.

GlobalISel was clamping the number of elements in vector stores into 64 bits
instead.

This results in some poor codegen like below:

https://godbolt.org/z/E56dq8

```
; SDAG uses a stp + q registers in both cases here.
define void @float(<16 x float> %val, <16 x float>* %ptr) {
 store <16 x float> %val, <16 x float>* %ptr
 ret void
}

define void @double(<8 x double> %val, <8 x double>* %ptr) {
 store <8 x double> %val, <8 x double>* %ptr
 ret void
}
```

This adds similar legalization for vector stores with s8 and s16 elements.

Differential Revision: https://reviews.llvm.org/D95107

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