Made the detailed reason for deopts mandatory on ia32. Unified and improved things.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index e9633a14f3d74dd4ab393d73eb6d3fd097c46aaf..fa05dd254c879a01b0bd0684230ec80e83804207 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -440,7 +440,9 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   if (exponent_type() != INTEGER) {
     Label fast_power, try_arithmetic_simplification;
     __ DoubleToI(exponent, double_exponent, double_scratch,
-                 TREAT_MINUS_ZERO_AS_ZERO, &try_arithmetic_simplification);
+                 TREAT_MINUS_ZERO_AS_ZERO, &try_arithmetic_simplification,
+                 &try_arithmetic_simplification,
+                 &try_arithmetic_simplification);
     __ jmp(&int_exponent);
 
     __ bind(&try_arithmetic_simplification);