[X86][test] Update CHECK prefixes in CodeGen/X86/vector-interleaved-load-*.ll to suppress warnings

Suppress warnings like

WARNING: Prefix AVX had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX1 had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX2 had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX2-ONLY had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX512 had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX512F had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX512F-ONLY had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX512-FAST had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll
WARNING: Prefix AVX512DQ-ONLY had conflicting output from different RUN lines for all functions in test vector-interleaved-load-i16-stride-7.ll