lto gimple types and debug info

[Paolo Bonzini]

Mark Mitchell wrote:
> For that matter, "print sizeof(X)" should print the 
> same value when debugging optimized code as when debugging unoptimized 
> code, even if the compiler has optimized X away to an empty structure!

I disagree.  sizeof(X) in the code will return a value as small as 
possible in that case (so that malloc-ing an array of structures) does 
not waste memory, and the debugger should do the same.

Paolo