Mangling sizeof

[Jason Merrill]

I've been looking at some old GCC bug reports and noticed that my recent 
mangling improvements didn't extend the use of the expression type stubs 
to sizeof expressions, so we still run into mangling holes in that 
context.  What do people think about using the type stubs in sizeof 
expressions as well?  This would break ABI compatibility with most 
existing uses of sizeof in template signatures, but I suspect those are 
very few currently because of the limitations of expression mangling 
(prior to the recent enhancements).

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