Allow peeking forward several tokens with MCAsmLexer

[Dylan McKay via llvm-commits]

CCing code owner.

On Sun, Aug 16, 2015 at 2:23 AM, Dylan McKay <dylanmckay34 at gmail.com> wrote:

> This patch extends the assembly lexer to add a new method - peekTokens()
> which can be used to peek forward one or more tokens.
>
> This gives backend authors a little bit more power if they need it.
> ​
>
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