Revert r109428 "Hoist argument type checking into CheckFormatHandler.  This is prep for scanf format"

Got errors about ASTContext being undefined with Visual Studio 2010.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109491 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed