[Bug tree-optimization/47679] [4.8/4.9/5 Regression] Strange uninitialized warning after SRA

[gafnium@yandex-team.ru]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47679

Sergey Eliseev <gafnium@yandex-team.ru> changed:

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--- Comment #16 from Sergey Eliseev <gafnium@yandex-team.ru> ---
Created attachment 34425
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34425&action=edit
Another warning appearance example

Found similar warning in optional value comparison. 
GCC 4.8.3, boost::optional 1.40 and 1.53 

Compile with -O2 -Wall -Werror