Add {lda,stl}x?r{,b,h} instructions to ARM64 assembler/disassembler

src/arm64/instrument-arm64.cc

Index: src/arm64/instrument-arm64.cc
diff --git a/src/arm64/instrument-arm64.cc b/src/arm64/instrument-arm64.cc
index 7a8e2f4ee1dd4a02d66fe2b2fc48fbdfe274d79a..dad89fe6bffff03ffb695a53e0617c5cd4779e14 100644
--- a/src/arm64/instrument-arm64.cc
+++ b/src/arm64/instrument-arm64.cc
@@ -429,6 +429,31 @@ void Instrument::VisitLoadStoreUnsignedOffset(Instruction* instr) {
   InstrumentLoadStore(instr);
 }
 
+void Instrument::VisitLoadStoreAcquireRelease(Instruction* instr) {
+  Update();
+  static Counter* load_counter = GetCounter("Load Acquire");
+  static Counter* store_counter = GetCounter("Store Release");
+
+  switch (instr->Mask(LoadStoreAcquireReleaseMask)) {
+    case LDAR_b:   // Fall-through.
+    case LDAR_h:   // Fall-through.
+    case LDAR_w:   // Fall-through.
+    case LDAR_x:   // Fall-through.
+    case LDAXR_b:  // Fall-through.
+    case LDAXR_h:  // Fall-through.
+    case LDAXR_w:  // Fall-through.
+    case LDAXR_x: load_counter->Increment(); break;
+    case STLR_b:   // Fall-through.
+    case STLR_h:   // Fall-through.
+    case STLR_w:   // Fall-through.
+    case STLR_x:   // Fall-through.
+    case STLXR_b:  // Fall-through.
+    case STLXR_h:  // Fall-through.
+    case STLXR_w:  // Fall-through.
+    case STLXR_x: store_counter->Increment(); break;
+    default: UNREACHABLE();
+  }
+}
 
 void Instrument::VisitLogicalShifted(Instruction* instr) {
   Update();