Require SSE2 support for the ia32 port.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 63c3ee6014c03938a67523ae2e970b4a93daf512..f43b81d7e1cac384ebaf8902dc63c6f23b3e891c 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -3446,12 +3446,8 @@ void FullCodeGenerator::EmitMathPow(CallRuntime* expr) {
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
 
-  if (CpuFeatures::IsSupported(SSE2)) {
-    MathPowStub stub(isolate(), MathPowStub::ON_STACK);
-    __ CallStub(&stub);
-  } else {
-    __ CallRuntime(Runtime::kHiddenMathPowSlow, 2);
-  }
+  MathPowStub stub(isolate(), MathPowStub::ON_STACK);
+  __ CallStub(&stub);
   context()->Plug(eax);
 }