[compiler-rt] recommit of r218481: ASan debugging API for report info extraction and locating addresses

Reviewed at http://reviews.llvm.org/D4527

Fixed a test case failure on 32-bit Linux, I did right shift on intptr_t, instead it should have been uintptr_t.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@218538 91177308-0d34-0410-b5e6-96231b3b80d8