[PATCH] [mips] [IAS] Fix parsing of memory offset expressions with parenthesis depth >1.

[Toma Tabacu]

Hi dsanders, rafael,

In an expression such as "(((a+b)+c)+d)", parseParenExpression() would only parse the "a+b)+c", which would result in an error later on in the parser.
This means that we can only parse one level of inner parentheses.

In order to fix this, I added a new function called parseParenExprOfDepth(), which parses a specified number of trailing parenthesis expressions
(except for the outermost parenthesis), and changed MipsAsmParser to use it in parseMemOffset instead of parseParenExpression().

http://reviews.llvm.org/D9742

Files:
  include/llvm/MC/MCParser/MCAsmParser.h
  lib/MC/MCParser/AsmParser.cpp
  lib/Target/Mips/AsmParser/MipsAsmParser.cpp
  test/MC/Mips/expr1.s

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