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* tree-vect-patterns.c (vect_recog_rotate_pattern): For vect_external_def oprnd1 with loop_vinfo, try to emit optional cast, negation and and stmts on the loop preheader edge instead of into the pattern def seq. * gcc.target/i386/rotate-4.c: Compile only with -mavx instead of -mavx2, require only avx instead of avx2. * gcc.target/i386/rotate-4a.c: Include avx-check.h instead of avx2-check.h and turn into an avx runtime test instead of avx2 runtime test. From-SVN: r199005
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