re PR target/70574 (wrong code with -mavx2, read of partially initialised stack variable)
PR rtl-optimization/70574 * fwprop.c (forward_propagate_and_simplify): Don't add REG_EQUAL note if DF_REF_REG (use) is a paradoxical subreg. (try_fwprop_subst): Don't add REG_EQUAL note if there are any paradoxical subregs within *loc. * gcc.target/i386/avx2-pr70574.c: New test. From-SVN: r234833
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gcc/testsuite/gcc.target/i386/avx2-pr70574.c
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