[stubs] Remove CSA::AssertInstanceType() in favour of CSA_ASSERT(HasInstanceType()).

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 122fbebfb16b096ffe943f11eddcd5840bb49d44..734211a1e7729a317f3de134ff0108bd51071700 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -248,8 +248,6 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   compiler::Node* LoadInstanceType(compiler::Node* object);
   // Compare the instance the type of the object against the provided one.
   compiler::Node* HasInstanceType(compiler::Node* object, InstanceType type);
-  // Checks that given heap object has given instance type.
-  void AssertInstanceType(compiler::Node* object, InstanceType instance_type);
   // Load the properties backing store of a JSObject.
   compiler::Node* LoadProperties(compiler::Node* object);
   // Load the elements backing store of a JSObject.