[mips] Partially revert r193640. Stack alignment should not be determined by
the floating point register mode.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194426 91177308-0d34-0410-b5e6-96231b3b80d8
Add a testcase where we replace a destructor with an alias.

This is a reduced testcase from a cast to Function failing during bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194430 91177308-0d34-0410-b5e6-96231b3b80d8