implement adaptive redzones about address-sanitizer HOT 8 CLOSED

We may want to implement adaptive redzones for globals and for heap. 
Maybe even for stack. 
The hypothesis is that large objects tend to be overflown by larger amounts. 
I don't think this should have anything to do with two-dimensional arrays. 

- adaptive redzones for globals are committed as LLVM r173335/r173336
- adaptive redzones for heap are a part of the new asan allocator

Need to think what to do with stack. 

A somewhat related problem: http://llvm.org/bugs/show_bug.cgi?id=16277
(can't handle stack objects aligned by more than 32 bytes).
This may potentially be solved together with adaptive redzones for stack. 

Fixed, see https://code.google.com/p/address-sanitizer/issues/detail?id=245#c2

Adding Project:AddressSanitizer as part of GitHub migration.