[hackers] [libzahl] Add reference to clang bug report || Mattias Andrée

[git]

commit 6125c42b419f0ea6aa456d3f47c973f5b512dc5c
Author:     Mattias Andrée <maand...@kth.se>
AuthorDate: Mon Mar 14 00:14:22 2016 +0100
Commit:     Mattias Andrée <maand...@kth.se>
CommitDate: Mon Mar 14 00:14:22 2016 +0100

    Add reference to clang bug report
    
    Signed-off-by: Mattias Andrée <maand...@kth.se>

diff --git a/src/allocator.c b/src/allocator.c
index 41ce9ed..fd821a9 100644
--- a/src/allocator.c
+++ b/src/allocator.c
@@ -34,6 +34,7 @@ libzahl_realloc(z_t a, size_t need)
        zahl_char_t *new;
 
 #if defined(__clang__)
+       /* https://llvm.org/bugs/show_bug.cgi?id=26930 */
        need = clang_warkaround_next_2pow(need);
 #else
        NEXT_2POW(need);