[3.3/3.4/3.5 Regression] Performace regression: poor optimization of const memory

[Andrew Haley]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12419

This regression is most unfortunate because it penalizes languages
that use virtual function dispatch tables in const memory: AFAIK that
means C++ and Java at least.

The regression seems to have been introduced because of a double write
problem in C++ constructors.

Can one of you optimization gurus look at this one, please?

Andrew.