Add dynamic stack frame alignment to optimized functions with untagged doubles on the stack.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index e64bdbfff2011658bb94022cbd5c48e2e5d29ce8..7537509a713536106091faeaba0bc75bbf6d7107 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -6578,7 +6578,11 @@ class Oddball: public HeapObject {
   static const byte kNull = 3;
   static const byte kArgumentMarker = 4;
   static const byte kUndefined = 5;
-  static const byte kOther = 6;
+  static const byte kFrameAlignmentMarker = 6;

[Kevin Millikin (Chromium), 2011/09/23 09:38:49]

You never use this constant that I can see.  Can you just reuse kOther?  I'm not
sure it's critical to have as many tags as oddballs.

[William Hesse, 2011/09/23 12:50:11]

Done.

+  static const byte kOther = 7;
+
+  // The ToNumber value of a hidden oddball is a negative smi.
+  static const int kLeastHiddenOddballNumber = -5;
 
   typedef FixedBodyDescriptor<kToStringOffset,
                               kToNumberOffset + kPointerSize,