[PATCH] Fix for PR64741 (UBSan/ASan integration)

[Yury Gribov]

Hi all,

As described in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64741 , 
ASan may currently report false positives for UBSan internal variables 
due to their incomplete type information. This patch fixes this.

Bootstrapped and regtested on Linux x64. Ok to commit?

-Y
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