[patch] Don't use alias from derived dtor to base dtor at -O0

[Rafael Espíndola]

The attached patch disables aliasing (and rauw) of derived dtors to
base dtors at -O0. This optimization can have a negative impact on the
debug quality.

This was a latent bug for some time with local classes, but got
noticed when it was generalized and broke gdb's destrprint.exp.

Cheers,
Rafael
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