Re-reland: Remove register index/code indirection

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 01f33a560b65a33880de9fc3a3b408bc7fe1237c..0d4576d85cf2881b3c98208521f652e4d5fbf31f 100644
--- a/src/mips/assembler-mips-inl.h
+++ b/src/mips/assembler-mips-inl.h
@@ -84,36 +84,6 @@ bool Operand::is_reg() const {
 }
 
 
-int Register::NumAllocatableRegisters() {
-    return kMaxNumAllocatableRegisters;
-}
-
-
-int DoubleRegister::NumRegisters() {
-    return FPURegister::kMaxNumRegisters;
-}
-
-
-int DoubleRegister::NumAllocatableRegisters() {
-    return FPURegister::kMaxNumAllocatableRegisters;
-}
-
-
-int DoubleRegister::NumAllocatableAliasedRegisters() {
-  return NumAllocatableRegisters();
-}
-
-
-int FPURegister::ToAllocationIndex(FPURegister reg) {
-  DCHECK(reg.code() % 2 == 0);
-  DCHECK(reg.code() / 2 < kMaxNumAllocatableRegisters);
-  DCHECK(reg.is_valid());
-  DCHECK(!reg.is(kDoubleRegZero));
-  DCHECK(!reg.is(kLithiumScratchDouble));
-  return (reg.code() / 2);
-}
-
-
 // -----------------------------------------------------------------------------
 // RelocInfo.