[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/arm/frames-arm.h

Index: src/arm/frames-arm.h
diff --git a/src/arm/frames-arm.h b/src/arm/frames-arm.h
index f656d592ec971383a14bffb40ab337bf0ac4835d..c3b8eed4808814ce355ebb9807bdfa5eb2e26e06 100644
--- a/src/arm/frames-arm.h
+++ b/src/arm/frames-arm.h
@@ -76,6 +76,18 @@ static const RegList kCalleeSaved =
 static const int kNumCalleeSaved = 7 + kR9Available;
 
 
+// Number of registers for which space is reserved in safepoints. Must be a
+// multiple of 8.
+// TODO(regis): Only 8 registers may actually be sufficient. Revisit.
+static const int kNumSafepointRegisters = 16;
+
+// Define the list of registers actually saved at safepoints.
+// Note that the number of saved registers may be smaller than the reserved
+// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
+static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
+static const int kNumSafepointSavedRegisters =
+    kNumJSCallerSaved + kNumCalleeSaved;
+
 // ----------------------------------------------------
 
 
@@ -101,7 +113,9 @@ class ExitFrameConstants : public AllStatic {
   static const int kCodeOffset = -1 * kPointerSize;
   static const int kSPOffset = -1 * kPointerSize;
 
-  static const int kSavedRegistersOffset = 0 * kPointerSize;
+  // TODO(regis): Use a patched sp value on the stack instead.
+  // A marker of 0 indicates that double registers are saved.
+  static const int kMarkerOffset = -2 * kPointerSize;
 
   // The caller fields are below the frame pointer on the stack.
   static const int kCallerFPOffset = +0 * kPointerSize;