[mips] [IAS] Implement the .asciiz directive.

Summary:
This directive is exactly the same as .asciz, except it's only used by MIPS.
It is used to store null terminated strings in object files.

Reviewers: rafael, dsanders, echristo

Reviewed By: dsanders, echristo

Subscribers: echristo, llvm-commits

Differential Revision: http://reviews.llvm.org/D7530

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235382 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCParser/MCAsmParser.h

@@ -84,6 +84,8 @@ public:
   virtual void addDirectiveHandler(StringRef Directive,
                                    ExtensionDirectiveHandler Handler) = 0;
 
+  virtual void addAliasForDirective(StringRef Directive, StringRef Alias) = 0;
+
   virtual SourceMgr &getSourceManager() = 0;
 
   virtual MCAsmLexer &getLexer() = 0;