Objects allocated after a call to __lsan_disable() will be treated as
live memory. Also add a ScopedDisabler.

llvm-svn: 183099

llvm-svn: 182994

In this CL all old tests are removed and one LIT test is added.

llvm-svn: 182730

llvm-svn: 182657

llvm-svn: 182648

llvm-svn: 182646

llvm-svn: 182641

llvm-svn: 182389

Also, define CAN_SANITIZE_LEAKS.

llvm-svn: 182383

Separate the notions of user-visible chunk and allocator chunk, to facilitate
ASan integration.

llvm-svn: 182256

Leak checking functionality which will be shared between
LSan/ASan/MSan.

llvm-svn: 182249