[compiler] Remove compiler internals from CodeAssembler.

src/code-stub-assembler.h

 // Copyright 2016 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_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 20 matching lines @@
   // TODO(rmcilroy): move result_size to the CallInterfaceDescriptor.
   CodeStubAssembler(Isolate* isolate, Zone* zone,
                     const CallInterfaceDescriptor& descriptor,
                     Code::Flags flags, const char* name,
                     size_t result_size = 1);
 
   // Create with JSCall linkage.
   CodeStubAssembler(Isolate* isolate, Zone* zone, int parameter_count,
                     Code::Flags flags, const char* name);
 
+  enum AllocationFlag : uint8_t {
+    kNone = 0,
+    kDoubleAlignment = 1,
+    kPretenured = 1 << 1
+  };
+
+  typedef base::Flags<AllocationFlag> AllocationFlags;
+
   enum ParameterMode { INTEGER_PARAMETERS, SMI_PARAMETERS };
 
   compiler::Node* BooleanMapConstant();
   compiler::Node* EmptyStringConstant();
   compiler::Node* HeapNumberMapConstant();
   compiler::Node* NoContextConstant();
   compiler::Node* NanConstant();
   compiler::Node* NullConstant();
   compiler::Node* MinusZeroConstant();
   compiler::Node* UndefinedConstant();
@@ skipping 531 matching lines @@
 
   compiler::Node* AllocateRawAligned(compiler::Node* size_in_bytes,
                                      AllocationFlags flags,
                                      compiler::Node* top_address,
                                      compiler::Node* limit_address);
   compiler::Node* AllocateRawUnaligned(compiler::Node* size_in_bytes,
                                        AllocationFlags flags,
                                        compiler::Node* top_adddress,
                                        compiler::Node* limit_address);
 
+  compiler::Node* SmiShiftBitsConstant();
+
   static const int kElementLoopUnrollThreshold = 8;
 };
 
+DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
+
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_