Reland r21101: "ARM64: use jssp for stack slots"

src/arm64/lithium-codegen-arm64.h

Index: src/arm64/lithium-codegen-arm64.h
diff --git a/src/arm64/lithium-codegen-arm64.h b/src/arm64/lithium-codegen-arm64.h
index 809ed556d06843fea17b7f0d5d4bd6f6b6f1d96d..06cc92f0e3e1f46b568b598bcab681c1fbbe52d6 100644
--- a/src/arm64/lithium-codegen-arm64.h
+++ b/src/arm64/lithium-codegen-arm64.h
@@ -37,7 +37,8 @@ class LCodeGen: public LCodeGenBase {
         frame_is_built_(false),
         safepoints_(info->zone()),
         resolver_(this),
-        expected_safepoint_kind_(Safepoint::kSimple) {
+        expected_safepoint_kind_(Safepoint::kSimple),
+        pushed_arguments_(0) {
     PopulateDeoptimizationLiteralsWithInlinedFunctions();
   }
 
@@ -81,7 +82,9 @@ class LCodeGen: public LCodeGenBase {
   Register ToRegister32(LOperand* op) const;
   Operand ToOperand(LOperand* op);
   Operand ToOperand32(LOperand* op);
-  MemOperand ToMemOperand(LOperand* op) const;
+  enum StackMode { kMustUseFramePointer, kCanUseStackPointer };
+  MemOperand ToMemOperand(LOperand* op,
+                          StackMode stack_mode = kCanUseStackPointer) const;
   Handle<Object> ToHandle(LConstantOperand* op) const;
 
   template <class LI>
@@ -358,6 +361,15 @@ class LCodeGen: public LCodeGenBase {
 
   Safepoint::Kind expected_safepoint_kind_;
 
+  // The number of arguments pushed onto the stack, either by this block or by a
+  // predecessor.
+  int pushed_arguments_;
+
+  void RecordPushedArgumentsDelta(int delta) {
+    pushed_arguments_ += delta;
+    DCHECK(pushed_arguments_ >= 0);
+  }
+
   int old_position_;
 
   class PushSafepointRegistersScope BASE_EMBEDDED {