[PR c++/35056] convert bitfield to target expr type for const& binding

[Alexandre Oliva]

We failed to convert bit-fields to their "identity conversion" types
for function calls, when building a temporary for a call that binds a
const reference to (a copy of) a bit-field.

This patch integrates the most conservative change I could come up
with, which I believe should be enough, with an assert that should
help us find any other situations in which it would have been
necessary.

This has passed the C++ testsuite; I'm now doing a full rebuild of all
libraries and regression-testing all testsuites.  Ok to install if
this passes?

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-- 
Alexandre Oliva         http://www.lsd.ic.unicamp.br/~oliva/
FSF Latin America Board Member         http://www.fsfla.org/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}