Merging r245560:

------------------------------------------------------------------------
r245560 | ogoffart | 2015-08-20 06:11:14 -0700 (Thu, 20 Aug 2015) | 5 lines

Fix crash with two typos in the arguments of a function

The problem is that the arguments are of TheCall are reset later
to the ones in Args, making TypoExpr put back. Some TypoExpr that have
already  been diagnosed and will assert later in Sema::getTypoExprState
------------------------------------------------------------------------

llvm-svn: 245615