MIPS: [turbofan] Add backend support for float32.

src/mips/assembler-mips-inl.h

Index: src/mips/assembler-mips-inl.h
diff --git a/src/mips/assembler-mips-inl.h b/src/mips/assembler-mips-inl.h
index 2666f6ada7c0006999fb2c9fd12f3a4c7bb8cec2..1cd9361e9a28a461e4122f852d8191ff353a8f66 100644
--- a/src/mips/assembler-mips-inl.h
+++ b/src/mips/assembler-mips-inl.h
@@ -99,6 +99,11 @@ int DoubleRegister::NumAllocatableRegisters() {
 }
 
 
+int DoubleRegister::NumAllocatableAliasedRegisters() {
+  return NumAllocatableRegisters();
+}
+
+
 int FPURegister::ToAllocationIndex(FPURegister reg) {
   DCHECK(reg.code() % 2 == 0);
   DCHECK(reg.code() / 2 < kMaxNumAllocatableRegisters);