Remove almost all of Oilpan

sky/engine/platform/heap/asm/SaveRegisters_mips64.S

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/*
- * typedef void (*PushAllRegistersCallback)(SafePointBarrier*, ThreadState*, intptr_t*);
- * extern "C" void pushAllRegisters(SafePointBarrier*, ThreadState*, PushAllRegistersCallback)
- */
-
-.type pushAllRegisters, %function
-.global pushAllRegisters
-.hidden pushAllRegisters
-pushAllRegisters:
-        // Push all callee-saves registers to get them
-        // on the stack for conservative stack scanning.
-        // Reserve space for callee-saved registers and return address.
-        daddiu $sp,$sp,-80
-        // Save the callee-saved registers and the return address.
-        sd $s0,0($sp)
-        sd $s1,8($sp)
-        sd $s2,16($sp)
-        sd $s3,24($sp)
-        sd $s4,32($sp)
-        sd $s5,40($sp)
-        sd $s6,48($sp)
-        sd $s7,56($sp)
-        sd $ra,64($sp)
-        // Note: the callee-saved floating point registers do not need to be
-        // copied to the stack, because fp registers never hold heap pointers
-        // and so do not need to be kept visible to the garbage collector.
-        // Pass the two first arguments untouched in a0 and a1 and the
-        // stack pointer to the callback.
-        move $t9,$a2
-        move $a2,$sp
-        jal $t9
-        // Restore return address, adjust stack and return.
-        // Note: the copied registers do not need to be reloaded here,
-        // because they were preserved by the called routine.
-        ld $ra,64($sp)
-        daddiu $sp,$sp,80
-        jr $ra