S390: [Atomics] Make Atomics.store a builtin using TF

src/compiler/s390/code-generator-s390.cc

Index: src/compiler/s390/code-generator-s390.cc
diff --git a/src/compiler/s390/code-generator-s390.cc b/src/compiler/s390/code-generator-s390.cc
index 1a93b54b0071d1a2a998d0b12ecd81a3737f516d..ccd4ee3f06da5696e3b8e6b93827482e8eeb324e 100644
--- a/src/compiler/s390/code-generator-s390.cc
+++ b/src/compiler/s390/code-generator-s390.cc
@@ -1657,6 +1657,15 @@ CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
     case kAtomicLoadWord32:
       __ LoadlW(i.OutputRegister(), i.MemoryOperand());
       break;
+    case kAtomicStoreWord8:
+      __ StoreByte(i.InputRegister(0), i.MemoryOperand(NULL, 1));
+      break;
+    case kAtomicStoreWord16:
+      __ StoreHalfWord(i.InputRegister(0), i.MemoryOperand(NULL, 1));
+      break;
+    case kAtomicStoreWord32:
+      __ StoreW(i.InputRegister(0), i.MemoryOperand(NULL, 1));
+      break;
     default:
       UNREACHABLE();
       break;