[Atomics] code stubs for atomic operations

src/compiler/code-stub-assembler.cc

Index: src/compiler/code-stub-assembler.cc
diff --git a/src/compiler/code-stub-assembler.cc b/src/compiler/code-stub-assembler.cc
index 772a1bf0c67a2ca19442428abca3743a88566ae1..425f6bee7d5969fedb77a0ea8f47c38b1b7b4a80 100644
--- a/src/compiler/code-stub-assembler.cc
+++ b/src/compiler/code-stub-assembler.cc
@@ -1276,6 +1276,11 @@ Node* CodeStubAssembler::StringFromCharCode(Node* code) {
   return var_result.value();
 }
 
+Node* CodeStubAssembler::TruncateFloat64ToInt32(Node* value) {
+  return raw_assembler_->TruncateFloat64ToInt32(TruncationMode::kJavaScript,
+                                                value);
+}
+
 void CodeStubAssembler::BranchIf(Node* condition, Label* if_true,
                                  Label* if_false) {
   Label if_condition_is_true(this), if_condition_is_false(this);