Refactor FrameAndConstantPoolScope and ConstantPoolUnavailableScope to be architecture independent

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index b296d517584368d183cbfdbfb70d738a64de3d90..e1f9c813881d184e8d214cc607b2f583b7576e81 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -1147,6 +1147,8 @@ class Assembler : public AssemblerBase {
   // Generate the constant pool for the generated code.
   void PopulateConstantPool(ConstantPoolArray* constant_pool);
 
+  bool is_constant_pool_available() const { return false; }
+
  protected:
   // Relocation for a type-recording IC has the AST id added to it.  This
   // member variable is a way to pass the information from the call site to
@@ -1210,6 +1212,11 @@ class Assembler : public AssemblerBase {
     return block_buffer_growth_;
   }
 
+  void set_constant_pool_available(bool available) {
+    // Constant pool is not supported on mips64.
+    UNREACHABLE();
+  }
+
  private:
   // Buffer size and constant pool distance are checked together at regular
   // intervals of kBufferCheckInterval emitted bytes.
@@ -1405,6 +1412,10 @@ class Assembler : public AssemblerBase {
   PositionsRecorder positions_recorder_;
   friend class PositionsRecorder;
   friend class EnsureSpace;
+
+  // constant pool
+  friend class FrameAndConstantPoolScope;
+  friend class ConstantPoolUnavailableScope;
 };