Fix MIPS build broken by r12735 'Allow unaligned accesses for ARMv7'.

src/mips/regexp-macro-assembler-mips.h

Index: src/mips/regexp-macro-assembler-mips.h
diff --git a/src/mips/regexp-macro-assembler-mips.h b/src/mips/regexp-macro-assembler-mips.h
index 5446f52439ff8708dec9f26b1d39bc89baa58065..8dd52a48473a0d71d6219574924d3a12a1f3385b 100644
--- a/src/mips/regexp-macro-assembler-mips.h
+++ b/src/mips/regexp-macro-assembler-mips.h
@@ -112,6 +112,7 @@ class RegExpMacroAssemblerMIPS: public NativeRegExpMacroAssembler {
   virtual void WriteCurrentPositionToRegister(int reg, int cp_offset);
   virtual void ClearRegisters(int reg_from, int reg_to);
   virtual void WriteStackPointerToRegister(int reg);
+  virtual bool CanReadUnaligned();
 
   // Called from RegExp if the stack-guard is triggered.
   // If the code object is relocated, the return address is fixed before