Revert "[MIPS] Use hard float calling convention for managed code"

MipsMir2Lir::LockCallTemps() is broken for secondary architecture on aosp_mips64-eng.

This reverts commit a29449dcf57c57fe0876f51367985477317cc557.

Change-Id: I480ea7569d73aea7894fc0a6dd804b1135286a37
diff --git a/compiler/utils/mips/assembler_mips.h b/compiler/utils/mips/assembler_mips.h
index 6c8b162..df95dad 100644
--- a/compiler/utils/mips/assembler_mips.h
+++ b/compiler/utils/mips/assembler_mips.h
@@ -141,7 +141,7 @@
   void LoadSFromOffset(FRegister reg, Register base, int32_t offset);
   void LoadDFromOffset(DRegister reg, Register base, int32_t offset);
   void StoreToOffset(StoreOperandType type, Register reg, Register base, int32_t offset);
-  void StoreSToOffset(FRegister reg, Register base, int32_t offset);
+  void StoreFToOffset(FRegister reg, Register base, int32_t offset);
   void StoreDToOffset(DRegister reg, Register base, int32_t offset);
 
   // Emit data (e.g. encoded instruction or immediate) to the instruction stream.
@@ -277,19 +277,6 @@
   int32_t EncodeBranchOffset(int offset, int32_t inst, bool is_jump);
   int DecodeBranchOffset(int32_t inst, bool is_jump);
 
-  FRegister ConvertDRegToFReg(DRegister reg) {
-    return static_cast<FRegister>(reg * 2);
-  }
-  Register ConvertDRegToReg(DRegister reg) {
-    return static_cast<Register>(reg * 2);
-  }
-  Register ConvertFRegToReg(FRegister reg) {
-    return static_cast<Register>(reg);
-  }
-  FRegister ConvertRegToFReg(Register reg) {
-    return static_cast<FRegister>(reg);
-  }
-
   DISALLOW_COPY_AND_ASSIGN(MipsAssembler);
 };