Add static analysis to AST expressions that records whether a negative zero w...

src/ia32/codegen-ia32.h

Index: src/ia32/codegen-ia32.h
===================================================================
--- src/ia32/codegen-ia32.h	(revision 4129)
+++ src/ia32/codegen-ia32.h	(working copy)
@@ -469,7 +469,8 @@
   void GenericBinaryOperation(
       Token::Value op,
       StaticType* type,
-      OverwriteMode overwrite_mode);
+      OverwriteMode overwrite_mode,
+      bool no_negative_zero);
 
   // If possible, combine two constant smi values using op to produce
   // a smi result, and push it on the virtual frame, all at compile time.
@@ -483,7 +484,8 @@
                                     Handle<Object> constant_operand,
                                     StaticType* type,
                                     bool reversed,
-                                    OverwriteMode overwrite_mode);
+                                    OverwriteMode overwrite_mode,
+                                    bool no_negative_zero);
 
   // Emit code to perform a binary operation on two likely smis.
   // The code to handle smi arguments is produced inline.
@@ -491,7 +493,8 @@
   Result LikelySmiBinaryOperation(Token::Value op,
                                   Result* left,
                                   Result* right,
-                                  OverwriteMode overwrite_mode);
+                                  OverwriteMode overwrite_mode,
+                                  bool no_negative_zero);
 
   void Comparison(AstNode* node,
                   Condition cc,