[turbofan] Remove obsolete --turbo-shipping flag.

By now TurboFan is shipping on a broad range of language constructs and
wholesale disabling TurboFan can still be done with the --turbo-filter
flag. A dedicated flag controlling AST numbering heuristics is no longer
needed.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2155243006
Cr-Commit-Position: refs/heads/master@{#37900}

src/ast/ast-numbering.cc

@@ -56,12 +56,7 @@ class AstNumberingVisitor final : public AstVisitor<AstNumberingVisitor> {
     DisableSelfOptimization();
   }
   void DisableCrankshaft(BailoutReason reason) {
-    if (FLAG_turbo_shipping) {
-      properties_.flags() |= AstProperties::kDontCrankshaft;
-    } else {
-      dont_optimize_reason_ = reason;
-      DisableSelfOptimization();
-    }
+    properties_.flags() |= AstProperties::kDontCrankshaft;
   }
 
   template <typename Node>

src/flag-definitions.h

@@ -425,7 +425,6 @@ DEFINE_BOOL(turbo, false, "enable TurboFan compiler")
 DEFINE_IMPLICATION(turbo, turbo_asm_deoptimization)
 DEFINE_IMPLICATION(turbo, turbo_store_elimination)
 DEFINE_IMPLICATION(turbo, turbo_loop_peeling)
-DEFINE_BOOL(turbo_shipping, true, "enable TurboFan compiler on subset")
 DEFINE_BOOL(turbo_from_bytecode, false, "enable building graphs from bytecode")
 DEFINE_BOOL(turbo_sp_frame_access, false,
             "use stack pointer-relative access to frame wherever possible")