[RISCV][NFC] Fix RVV intrinsic tests.

[RISCV][NFC] Fix RVV intrinsic tests.

1. Skip the temporary file
2. Test cc1 with -S to verify codegen work well. Add '-target-feature
   +m' because the backend requires it to calculate the vscaled size/offset.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D99082