Implement Math.pow using FPU instructions and inline it in crankshaft (ia32).

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 6bda5da709e8de9e1c4b0edfea73ebc63a83fe59..dc07e5d67d8775e14a37e2381015c55e2e5ff884 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -442,12 +442,17 @@ class InstanceofStub: public CodeStub {
 
 class MathPowStub: public CodeStub {
  public:
-  MathPowStub() {}
+  enum ExponentType { INTEGER, DOUBLE, TAGGED, ON_STACK};
+
+  explicit MathPowStub(ExponentType exponent_type)
+      : exponent_type_(exponent_type) { }
   virtual void Generate(MacroAssembler* masm);
 
  private:
   virtual CodeStub::Major MajorKey() { return MathPow; }
-  virtual int MinorKey() { return 0; }
+  virtual int MinorKey() { return exponent_type_; }
+
+  ExponentType exponent_type_;
 };