Merging r296645: (PR32253)

Included an updated testcase

------------------------------------------------------------------------
[Hexagon] Fix lowering of formal arguments of type i1

On Hexagon, values of type i1 are passed in registers of type i32,
even though i1 is not a legal value for these registers. This is a
special case and needs special handling to maintain consistency of
the lowering information.

This fixes PR32089.
------------------------------------------------------------------------

llvm-svn: 301550