[turbofan] Remove useless implication.

Since loop peeling was shipped, there's no need to have the implication
from --turbo to --turbo-loop-peeling.

BUG=v8:5267
TBR=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2517073002
Cr-Commit-Position: refs/heads/master@{#41128}

src/flag-definitions.h

@@ -420,7 +420,6 @@ DEFINE_BOOL(omit_map_checks_for_leaf_maps, true,
 // Flags for TurboFan.
 DEFINE_BOOL(turbo, false, "enable TurboFan compiler")
 DEFINE_IMPLICATION(turbo, turbo_asm_deoptimization)
-DEFINE_IMPLICATION(turbo, turbo_loop_peeling)
 DEFINE_IMPLICATION(turbo, turbo_escape)
 DEFINE_BOOL(turbo_sp_frame_access, false,
             "use stack pointer-relative access to frame wherever possible")