Revert "[Sema] Make FunctionType's TSI use unadjusted argument types"

This reverts commit r183614.

It broke test/Sema/block-printf-attribute-1.c on non-Windows platforms,
and the fix is not trivial.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183616 91177308-0d34-0410-b5e6-96231b3b80d8
Add a test case for blocks taking an array typedef

r183614 was failing because va_list on some platforms is defined in a
similar manner.  This test fails on Windows with r183614 applied.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183617 91177308-0d34-0410-b5e6-96231b3b80d8