ASM_SIMP_TAC does a simplification of the goal, adding both the
assumptions and the provided theorem to the given simpset as
rewrites. This simpset is then applied to the goal in the manner
explained in the entry for SIMP_CONV.
ASM_SIMP_TAC is to SIMP_TAC, as ASM_REWRITE_TAC is to
REWRITE_TAC.