[turbofan] Ship TurboFan inlining.

Until now inlining in TurboFan was staged behind --turbo, which means
that it wasn't enabled with --turbo-shipping. It seems reasonable to
ship it now, since Clusterfuzz had fun with it for a year already, and
we need to reach parity with Crankshaft with more and more things being
enabled behind --turbo-shipping.

Review URL: https://codereview.chromium.org/1721243002

Cr-Commit-Position: refs/heads/master@{#34209}

src/flag-definitions.h

@@ -422,7 +422,6 @@ 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_inlining)
 DEFINE_BOOL(turbo_shipping, true, "enable TurboFan compiler on subset")
 DEFINE_BOOL(turbo_greedy_regalloc, false, "use the greedy register allocator")
 DEFINE_BOOL(turbo_sp_frame_access, false,
@@ -455,7 +454,7 @@ DEFINE_BOOL(function_context_specialization, false,
             "enable function context specialization in TurboFan")
 DEFINE_BOOL(native_context_specialization, true,
             "enable native context specialization in TurboFan")
-DEFINE_BOOL(turbo_inlining, false, "enable inlining in TurboFan")
+DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan")
 DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining")
 DEFINE_BOOL(loop_assignment_analysis, true, "perform loop assignment analysis")
 DEFINE_BOOL(turbo_profiling, false, "enable profiling in TurboFan")