Simplify DoubleRegister for the ia32 port.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index 66c6d1b83e742afb52debb87a5b159cc9505a2d8..984de00e485269766f80afd677b06060a46a1602 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -62,21 +62,6 @@ ExternalReference ExternalReference::cpu_features() {
 }
 
 
-int DoubleRegister::NumAllocatableRegisters() {
-  return XMMRegister::kNumAllocatableRegisters;
-}
-
-
-int DoubleRegister::NumRegisters() {
-  return XMMRegister::kNumRegisters;
-}
-
-
-const char* DoubleRegister::AllocationIndexToString(int index) {
-  return XMMRegister::AllocationIndexToString(index);
-}
-
-
 void CpuFeatures::Probe(bool serializer_enabled) {
   ASSERT(!initialized_);
   ASSERT(supported_ == 0);