Tentative implementation of string slices (hidden under the flag --string-slices).

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 6b60a6e40e3da4d9d50170b08dda492520ec9ad4..a0e54220113a166ad9b5eb8db75e1b6620458d23 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -1757,12 +1757,14 @@ class LStringAdd: public LTemplateInstruction<1, 3, 0> {
 };
 
 
-class LStringCharCodeAt: public LTemplateInstruction<1, 3, 0> {
+class LStringCharCodeAt: public LTemplateInstruction<1, 3, 1> {
  public:
-  LStringCharCodeAt(LOperand* context, LOperand* string, LOperand* index) {
+  LStringCharCodeAt(LOperand* context, LOperand* string,
+                    LOperand* index, LOperand* temp) {
     inputs_[0] = context;
     inputs_[1] = string;
     inputs_[2] = index;
+    temps_[0] = temp;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(StringCharCodeAt, "string-char-code-at")