[stubs] Add more assertions in the 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 e391278b8cfd4ed051a844f4a0b97b43bcf7b67c..9c7d3a3487b2c9d1231a6c7a0232bbebbcad6156 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -210,7 +210,6 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
                           Label* if_false);
   void BranchIfJSObject(compiler::Node* object, Label* if_true,
                         Label* if_false);
-
   void BranchIfFastJSArray(compiler::Node* object, compiler::Node* context,
                            Label* if_true, Label* if_false);
 
@@ -286,10 +285,6 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   compiler::Node* LoadMapConstructorFunctionIndex(compiler::Node* map);
   // Load the constructor of a Map (equivalent to Map::GetConstructor()).
   compiler::Node* LoadMapConstructor(compiler::Node* map);
-  // Check whether the map is for an object with special properties, such as a
-  // JSProxy or an object with interceptors.
-  compiler::Node* IsSpecialReceiverMap(compiler::Node* map);
-  compiler::Node* IsSpecialReceiverInstanceType(compiler::Node* instance_type);
   // Check if the map is set for slow properties.
   compiler::Node* IsDictionaryMap(compiler::Node* map);
 
@@ -306,6 +301,7 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   // Load value field of a JSValue object.
   compiler::Node* LoadJSValueValue(compiler::Node* object);
   // Load value field of a WeakCell object.
+  compiler::Node* LoadWeakCellValueUnchecked(compiler::Node* weak_cell);
   compiler::Node* LoadWeakCellValue(compiler::Node* weak_cell,
                                     Label* if_cleared = nullptr);
 
@@ -609,10 +605,26 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
                                          char const* method_name);
 
   // Type checks.
+  // Check whether the map is for an object with special properties, such as a
+  // JSProxy or an object with interceptors.
+  compiler::Node* IsSpecialReceiverMap(compiler::Node* map);
+  compiler::Node* IsSpecialReceiverInstanceType(compiler::Node* instance_type);
   compiler::Node* IsStringInstanceType(compiler::Node* instance_type);
+  compiler::Node* IsString(compiler::Node* object);
+  compiler::Node* IsJSObject(compiler::Node* object);
   compiler::Node* IsJSReceiverInstanceType(compiler::Node* instance_type);
-
+  compiler::Node* IsJSReceiver(compiler::Node* object);
+  compiler::Node* IsMap(compiler::Node* object);
   compiler::Node* IsCallableMap(compiler::Node* map);
+  compiler::Node* IsName(compiler::Node* object);
+  compiler::Node* IsJSValue(compiler::Node* object);
+  compiler::Node* IsJSArray(compiler::Node* object);
+  compiler::Node* IsNativeContext(compiler::Node* object);
+  compiler::Node* IsWeakCell(compiler::Node* object);
+  compiler::Node* IsFixedDoubleArray(compiler::Node* object);
+  compiler::Node* IsHashTable(compiler::Node* object);
+  compiler::Node* IsDictionary(compiler::Node* object);
+  compiler::Node* IsSeededNumberDictionary(compiler::Node* object);
 
   // String helpers.
   // Load a character from a String (might flatten a ConsString).
@@ -1156,6 +1168,17 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
                                            compiler::Node* value,
                                            Label* bailout);
 
+  compiler::Node* AllocateSlicedString(Heap::RootListIndex map_root_index,
+                                       compiler::Node* length,
+                                       compiler::Node* parent,
+                                       compiler::Node* offset);
+
+  compiler::Node* AllocateConsString(Heap::RootListIndex map_root_index,
+                                     compiler::Node* length,
+                                     compiler::Node* first,
+                                     compiler::Node* second,
+                                     AllocationFlags flags);
+
   static const int kElementLoopUnrollThreshold = 8;
 };