Fix FunctionParmPackExpr::Create() to take a ParmVarDecl* array.

Fix FunctionParmPackExpr::Create() to take a ParmVarDecl* array.

FunctionParmPackExpr actually stores an array of ParmVarDecl* (and
accessors return that). But, the FunctionParmPackExpr::Create()
constructor accepted an array of Decl *s instead.

It was easy for this mismatch to occur without any obvious sign of
something wrong, since both the store and the access used independent
'reinterpet_cast<XX>(this+1)' calls.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@248905 91177308-0d34-0410-b5e6-96231b3b80d8