A64: Synchronize with r18084.

src/a64/lithium-a64.cc

Index: src/a64/lithium-a64.cc
diff --git a/src/a64/lithium-a64.cc b/src/a64/lithium-a64.cc
index 04370fc3bf6f4364054ea4a8ad1885fe4f209fe9..275820c735a25e67121b297886bb1030097cdddc 100644
--- a/src/a64/lithium-a64.cc
+++ b/src/a64/lithium-a64.cc
@@ -948,6 +948,13 @@ LInstruction* LChunkBuilder::DoAdd(HAdd* instr) {
       result = AssignEnvironment(result);
     }
     return result;
+  } else if (instr->representation().IsExternal()) {
+    ASSERT(instr->left()->representation().IsExternal());
+    ASSERT(instr->right()->representation().IsInteger32());
+    ASSERT(!instr->CheckFlag(HValue::kCanOverflow));
+    LOperand* left = UseRegisterAtStart(instr->left());
+    LOperand* right = UseRegisterOrConstantAtStart(instr->right());
+    return DefineAsRegister(new(zone()) LAddI(left, right));
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::ADD, instr);
   } else {
@@ -1363,16 +1370,6 @@ LInstruction* LChunkBuilder::DoCompareNumericAndBranch(
 }
 
 
-// TODO(all): This will disappear when Math.random is rewritten in JavaScript.
-LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
-  ASSERT(instr->representation().IsDouble());
-  ASSERT(instr->global_object()->representation().IsTagged());
-  LOperand* global_object = UseFixed(instr->global_object(), x0);
-  LRandom* result = new(zone()) LRandom(global_object);
-  return MarkAsCall(DefineFixedDouble(result, d7), instr);
-}
-
-
 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   ASSERT(instr->left()->representation().IsTagged());
   ASSERT(instr->right()->representation().IsTagged());