[Math] implement Math.random as TFJ builtin.

src/code-stub-assembler.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 #include "src/ic/handler-configuration.h"
 #include "src/ic/stub-cache.h"
@@ skipping 1074 matching lines @@
     return nullptr;
   }
   return Load(machine_type, base, offset);
 }
 
 Node* CodeStubAssembler::LoadContextElement(Node* context, int slot_index) {
   int offset = Context::SlotOffset(slot_index);
   return Load(MachineType::AnyTagged(), context, IntPtrConstant(offset));
 }
 
+Node* CodeStubAssembler::StoreContextElement(Node* context, int slot_index,
+                                             Node* value) {
+  int offset = Context::SlotOffset(slot_index);
+  return Store(MachineRepresentation::kTagged, context, IntPtrConstant(offset),
+               value);
+}
+
 Node* CodeStubAssembler::LoadNativeContext(Node* context) {
   return LoadContextElement(context, Context::NATIVE_CONTEXT_INDEX);
 }
 
 Node* CodeStubAssembler::LoadJSArrayElementsMap(ElementsKind kind,
                                                 Node* native_context) {
   return LoadFixedArrayElement(native_context,
                                IntPtrConstant(Context::ArrayMapIndex(kind)));
 }
 
@@ skipping 6113 matching lines @@
     result.Bind(CallRuntime(Runtime::kInstanceOf, context, object, callable));
     Goto(&end);
   }
 
   Bind(&end);
   return result.value();
 }
 
 }  // namespace internal
 }  // namespace v8