Introduce Push and Pop register macro instructions for all platforms

src/mips/macro-assembler-mips.h

Index: src/mips/macro-assembler-mips.h
diff --git a/src/mips/macro-assembler-mips.h b/src/mips/macro-assembler-mips.h
index e679bfa04404c0d17410c04f892c32367a168ff2..ac37db2aaa1beaafe24e58cbe76611c46ae784fa 100644
--- a/src/mips/macro-assembler-mips.h
+++ b/src/mips/macro-assembler-mips.h
@@ -627,11 +627,11 @@ class MacroAssembler: public Assembler {
   void MultiPushFPU(RegList regs);
   void MultiPushReversedFPU(RegList regs);
 
-  // Lower case push() for compatibility with arch-independent code.
   void push(Register src) {
     Addu(sp, sp, Operand(-kPointerSize));
     sw(src, MemOperand(sp, 0));
   }
+  void Push(Register src) { push(src); }
 
   // Push a handle.
   void Push(Handle<Object> handle);
@@ -676,11 +676,11 @@ class MacroAssembler: public Assembler {
   void MultiPopFPU(RegList regs);
   void MultiPopReversedFPU(RegList regs);
 
-  // Lower case pop() for compatibility with arch-independent code.
   void pop(Register dst) {
     lw(dst, MemOperand(sp, 0));
     Addu(sp, sp, Operand(kPointerSize));
   }
+  void Pop(Register dst) { pop(dst); }
 
   // Pop two registers. Pops rightmost register first (from lower address).
   void Pop(Register src1, Register src2) {