These lines in questions (in the diff) were changed later in eglibc svn by:
http://www.eglibc.org/cgi-bin/viewcvs.cgi/fsf/trunk/libc/malloc/malloc.c?rev=7881&r1=7832&r2=7881
 :
-   if (hook != NULL)      
+ if (__builtin_expect (hook != NULL, 0))

with changelog: Add branch prediction for use of the hooks.

and

http://www.eglibc.org/cgi-bin/viewcvs.cgi/fsf/trunk/libc/malloc/malloc.c?rev=8305&r1=8254&r2=8305
 :
-   __memalign_hook;         
+ force_reg (__memalign_hook);

with changelog: Force hook value into register.

-- 
2.0.0rc2 dies without any reason
https://bugs.launchpad.net/bugs/490024
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