Language independent return value optimizations
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This file implements return value optimizations for functions which
return aggregate types.
Basically this pass searches the function for return statements which
return a local aggregate. When converted to RTL such statements will
generate a copy from the local aggregate to final return value destination
mandated by the target's ABI.
That copy can often be avoided by directly constructing the return value
into the final destination mandated by the target's ABI.
This is basically a generic equivalent to the C++ front-end's
Named Return Value optimization.
1.12.0