[arm64] Use exclusive instructions in exchange

src/arm64/macro-assembler-arm64.h

Index: src/arm64/macro-assembler-arm64.h
diff --git a/src/arm64/macro-assembler-arm64.h b/src/arm64/macro-assembler-arm64.h
index 51dcb6086a2e05c0b60360a25c49d333683cc912..90eb9a6380358d3002b936b7622abac13928ff4e 100644
--- a/src/arm64/macro-assembler-arm64.h
+++ b/src/arm64/macro-assembler-arm64.h
@@ -68,20 +68,26 @@ namespace internal {
   V(Stp, CPURegister&, rt, rt2, StorePairOpFor(rt, rt2)) \
   V(Ldpsw, CPURegister&, rt, rt2, LDPSW_x)
 
-#define LDA_STL_MACRO_LIST(V) \
-  V(Ldarb, ldarb)             \
-  V(Ldarh, ldarh)             \
-  V(Ldar, ldar)               \
-  V(Ldaxrb, ldaxrb)           \
-  V(Ldaxrh, ldaxrh)           \
-  V(Ldaxr, ldaxr)             \
-  V(Stlrb, stlrb)             \
-  V(Stlrh, stlrh)             \
+#define LDX_LDA_STL_MACRO_LIST(V) \
+  V(Ldxrb, ldxrb)                 \
+  V(Ldxrh, ldxrh)                 \
+  V(Ldxr, ldxr)                   \
+  V(Ldarb, ldarb)                 \
+  V(Ldarh, ldarh)                 \
+  V(Ldar, ldar)                   \
+  V(Ldaxrb, ldaxrb)               \
+  V(Ldaxrh, ldaxrh)               \
+  V(Ldaxr, ldaxr)                 \
+  V(Stlrb, stlrb)                 \
+  V(Stlrh, stlrh)                 \
   V(Stlr, stlr)
 
-#define STLX_MACRO_LIST(V) \
-  V(Stlxrb, stlxrb)        \
-  V(Stlxrh, stlxrh)        \
+#define STX_STLX_MACRO_LIST(V) \
+  V(Stxrb, stxrb)              \
+  V(Stxrh, stxrh)              \
+  V(Stxr, stxr)                \
+  V(Stlxrb, stlxrb)            \
+  V(Stlxrh, stlxrh)            \
   V(Stlxr, stlxr)
 
 // ----------------------------------------------------------------------------
@@ -313,15 +319,15 @@ class MacroAssembler : public Assembler {
   void LoadStorePairMacro(const CPURegister& rt, const CPURegister& rt2,
                           const MemOperand& addr, LoadStorePairOp op);
 
-// Load-acquire/store-release macros.
+// Load/store exclusive and load-acquire/store-release macros.
 #define DECLARE_FUNCTION(FN, OP) \
   inline void FN(const Register& rt, const Register& rn);
-  LDA_STL_MACRO_LIST(DECLARE_FUNCTION)
+  LDX_LDA_STL_MACRO_LIST(DECLARE_FUNCTION)
 #undef DECLARE_FUNCTION
 
 #define DECLARE_FUNCTION(FN, OP) \
   inline void FN(const Register& rs, const Register& rt, const Register& rn);
-  STLX_MACRO_LIST(DECLARE_FUNCTION)
+  STX_STLX_MACRO_LIST(DECLARE_FUNCTION)
 #undef DECLARE_FUNCTION
 
   // V8-specific load/store helpers.