Complete separation of CodeAssembler and CodeStubAssembler

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 53718fc9d65575b428184be6665eaa5b7a244e55..07be1cdd583e0d1893df1c6b4a849711bddc8118 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -38,6 +38,11 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   compiler::Node* Float64Round(compiler::Node* x);
   compiler::Node* Float64Trunc(compiler::Node* x);
 
+  // Tag a Word as a Smi value.
+  compiler::Node* SmiTag(compiler::Node* value);
+  // Untag a Smi value as a Word.
+  compiler::Node* SmiUntag(compiler::Node* value);
+
   // Smi conversions.
   compiler::Node* SmiToFloat64(compiler::Node* value);
   compiler::Node* SmiFromWord32(compiler::Node* value);
@@ -55,6 +60,10 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   compiler::Node* SmiLessThanOrEqual(compiler::Node* a, compiler::Node* b);
   compiler::Node* SmiMin(compiler::Node* a, compiler::Node* b);
 
+  // Allocate an object of the given size.
+  compiler::Node* Allocate(int size, AllocationFlags flags = kNone);
+  compiler::Node* InnerAllocate(compiler::Node* previous, int offset);
+
   // Check a value for smi-ness
   compiler::Node* WordIsSmi(compiler::Node* a);
   // Check that the value is a positive smi.
@@ -179,6 +188,16 @@ class CodeStubAssembler : public compiler::CodeAssembler {
 
   compiler::Node* BitFieldDecode(compiler::Node* word32, uint32_t shift,
                                  uint32_t mask);
+
+ private:
+  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);
 };
 
 }  // namespace internal