Deprecate useless CompilationInfo::IsOptimizable predicate.

src/compiler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 274 matching lines @@
     return !closure().is_null() &&
         (closure()->context()->global_object() != NULL);
   }
 
   GlobalObject* global_object() const {
     return has_global_object() ? closure()->context()->global_object() : NULL;
   }
 
   // Accessors for the different compilation modes.
   bool IsOptimizing() const { return mode_ == OPTIMIZE; }
-  bool IsOptimizable() const { return mode_ == BASE; }
   bool IsStub() const { return mode_ == STUB; }
   void SetOptimizing(BailoutId osr_ast_id, Handle<Code> unoptimized) {
     DCHECK(!shared_info().is_null());
     SetMode(OPTIMIZE);
     osr_ast_id_ = osr_ast_id;
     unoptimized_code_ = unoptimized;
     optimization_id_ = isolate()->NextOptimizationId();
   }
 
   void SetFunctionType(Type::FunctionType* function_type) {
     function_type_ = function_type;
   }
   Type::FunctionType* function_type() const { return function_type_; }
 
   void SetStub(CodeStub* code_stub) {
     SetMode(STUB);
     code_stub_ = code_stub;
   }
 
   // Deoptimization support.
   bool HasDeoptimizationSupport() const {
     return GetFlag(kDeoptimizationSupport);
   }
   void EnableDeoptimizationSupport() {
-    DCHECK(IsOptimizable());
+    DCHECK_EQ(BASE, mode_);
     SetFlag(kDeoptimizationSupport);
   }
 
   // Determines whether or not to insert a self-optimization header.
   bool ShouldSelfOptimize();
 
   void set_deferred_handles(DeferredHandles* deferred_handles) {
     DCHECK(deferred_handles_ == NULL);
     deferred_handles_ = deferred_handles;
   }
@@ skipping 369 matching lines @@
   Zone zone_;
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_