This commit adds a virtual `peekTokens()` function to `MCAsmLexer`
which can peek forward an arbitrary number of tokens.
It also makes the `peekTok()` method call `peekTokens()` method, but
only requesting one token.
The idea is to better support targets which more more ambiguous
assembly syntaxes.
Patch by Dylan McKay!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245221 91177308-0d34-0410-b5e6-96231b3b80d8