[Atomics] Remove Atomics code stubs; use TF ops

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index 2918b9b7337d8c436f1042d13e0e24a5e24b7b9c..a4b7efa849ee21e1571398baf60f4e5e5651e553 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -316,7 +316,7 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   V(ObjectHasOwnProperty, 2)      \
   V(StringPrototypeCharAt, 2)     \
   V(StringPrototypeCharCodeAt, 2) \
-  V(AtomicsLoadCheck, 3)
+  V(AtomicsLoad, 3)
 
 // Define list of builtin handlers implemented in assembly.
 #define BUILTIN_LIST_H(V)                    \
@@ -674,7 +674,7 @@ class Builtins {
   static void Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm);
   static void Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm);
 
-  static void Generate_AtomicsLoadCheck(compiler::CodeStubAssembler* assembler);
+  static void Generate_AtomicsLoad(compiler::CodeStubAssembler* assembler);
 
   static void InitBuiltinFunctionTable();