In the calling convention logic, ValVT is always a legal type,

In the calling convention logic, ValVT is always a legal type,
and as such can be represented by an MVT - the more complicated
EVT is not needed.  Use MVT for ValVT everywhere.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118245 91177308-0d34-0410-b5e6-96231b3b80d8