[PR c++/20103] failure to gimplify constructors for addressable types

[Alexandre Oliva]

In the reduced testcase from the bug report, included in the patch
file below, we fail to gimplify the CONSTRUCTOR created for the
compound-literal expression.  When we attempt to create_tmp_var to
hold the B-typed value, it fails because B is addressable.

This patch introduces an alternate entry point for create_tmp_var that
accepts addressable types, and uses that in the relevant caller when
the value is a CONSTRUCTOR.

Bootstrapping on x86_64-linux-gnu, after successful C++ regression
testing on make all.  Ok to install if full bootstrap and regression
testing completes?

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