Didn't look deep, but here's one note.
================
Comment at: projects/compiler-rt/lib/asan/asan_interface_internal.h:53
@@ -44,1 +52,3 @@
uptr has_dynamic_init; // Non-zero if the global has dynamic initializer.
+ __asan_global_source_location *location; // Source location of a global,
+ // or NULL if it is unknown.
----------------
If you store file and line/column location separately you can probably save
some memory.
http://reviews.llvm.org/D4203
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