[compiler] Remove compiler internals from CodeAssembler.

src/compiler/code-assembler.cc

Index: src/compiler/code-assembler.cc
diff --git a/src/compiler/code-assembler.cc b/src/compiler/code-assembler.cc
index 0883fc18e858f4335f4a0132e570cf4dd986cdfd..6fd143b4dd9dd494e7e0485d9472896535c05e93 100644
--- a/src/compiler/code-assembler.cc
+++ b/src/compiler/code-assembler.cc
@@ -69,8 +69,8 @@ Handle<Code> CodeAssembler::GenerateCode() {
 
   Schedule* schedule = raw_assembler_->Export();
   Handle<Code> code = Pipeline::GenerateCodeForCodeStub(
-      isolate(), raw_assembler_->call_descriptor(), graph(), schedule, flags_,
-      name_);
+      isolate(), raw_assembler_->call_descriptor(), raw_assembler_->graph(),
+      schedule, flags_, name_);
 
   code_generated_ = true;
   return code;
@@ -198,10 +198,6 @@ Node* CodeAssembler::LoadStackPointer() {
   return raw_assembler_->LoadStackPointer();
 }
 
-Node* CodeAssembler::SmiShiftBitsConstant() {
-  return IntPtrConstant(kSmiShiftSize + kSmiTagSize);
-}
-
 #define DEFINE_CODE_ASSEMBLER_BINARY_OP(name)   \
   Node* CodeAssembler::name(Node* a, Node* b) { \
     return raw_assembler_->name(a, b);          \
@@ -909,8 +905,6 @@ Isolate* CodeAssembler::isolate() const { return raw_assembler_->isolate(); }
 
 Factory* CodeAssembler::factory() const { return isolate()->factory(); }
 
-Graph* CodeAssembler::graph() const { return raw_assembler_->graph(); }
-
 Zone* CodeAssembler::zone() const { return raw_assembler_->zone(); }
 
 // The core implementation of Variable is stored through an indirection so