[turbofan] Enable general purpose inlining.

R=bmeurer@chromium.org,hablich@chromium.org
BUG=v8:4493
LOG=n

Review URL: https://codereview.chromium.org/1416873007

Cr-Commit-Position: refs/heads/master@{#31634}

src/flag-definitions.h

@@ -439,7 +439,7 @@ 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")