Tests: wrong instruction assertions #1209
Description
Many intrinsics have wrong instruction assertions, e.g. all the AVX512 mm512_mask_blend_epi16* check for vmovdqu16 instead of vpblend*, on aarch64 vget_high_p64 tests for ldr instead of ext, etc.
Not sure how to systematically find the ones which are broken, but I can submit fixes for the ones I find.