[RV64_DYNAREC] Fixed vector infra

[ksco]

For vlen>128, we cannot use load/store whole vector instructions! Sorry for this mistake. This PR replaced all the whole vector load/stores with the normal ones, which requires the vtype to be set correctly using SET_ELEMENT_WIDTH().

[ksco]

Related to this PR:

I think there are certain limitations in the current vector infrastructure -- mainly for opcodes that are essentially element-width-agnostic.

For example, MOVDQA can be implemented with vle8.v, vle16.v, vle32.v, and vle64.v, it will be good if we know the predecessor's element width in compile time to choose the best one.

Previously I implemented MOVDQA with "load whole vector", but that unfortunately only works on vlen=128.

[ptitSeb]

Related to this PR:

I think there are certain limitations in the current vector infrastructure -- mainly for opcodes that are essentially element-width-agnostic.

For example, MOVDQA can be implemented with vle8.v, vle16.v, vle32.v, and vle64.v, it will be good if we know the predecessor's element width in compile time to choose the best one.

Previously I implemented MOVDQA with "load whole vector", but that unfortunately only works on vlen=128.

You can use a ecanism similar to float/i64/double of Float, but SSE handling is quite different, so an other mecanism should be used.