Simplify DoubleRegister for the ia32 port.

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 0801881ff0cdb93a9ece6ed178325b48f2d26016..6fcc1a62db65b5c2f0fd445597eb390504570ced 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -480,8 +480,8 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
   // restore them.
   __ pushad();
   if (save_doubles_ == kSaveFPRegs) {
-    __ sub(esp, Immediate(kDoubleSize * XMMRegister::kNumRegisters));
-    for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
+    __ sub(esp, Immediate(kDoubleSize * XMMRegister::kMaxNumRegisters));
+    for (int i = 0; i < XMMRegister::kMaxNumRegisters; i++) {
       XMMRegister reg = XMMRegister::from_code(i);
       __ movsd(Operand(esp, i * kDoubleSize), reg);
     }
@@ -496,11 +496,11 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
       ExternalReference::store_buffer_overflow_function(isolate()),
       argument_count);
   if (save_doubles_ == kSaveFPRegs) {
-    for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
+    for (int i = 0; i < XMMRegister::kMaxNumRegisters; i++) {
       XMMRegister reg = XMMRegister::from_code(i);
       __ movsd(reg, Operand(esp, i * kDoubleSize));
     }
-    __ add(esp, Immediate(kDoubleSize * XMMRegister::kNumRegisters));
+    __ add(esp, Immediate(kDoubleSize * XMMRegister::kMaxNumRegisters));
   }
   __ popad();
   __ ret(0);