[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 3f52d21b5532d90e34092c6a1e9ee8c3b4b87d9a..1da2fdd679186f5e237325e2094c90ee39f2f649 100644
--- a/src/compiler/code-stub-assembler.cc
+++ b/src/compiler/code-stub-assembler.cc
@@ -1311,6 +1311,11 @@ 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);