Change -fsanitize-memory-track-origins to be equivalent to
-fsanitize-memory-track-origins=2.

Track-origins=2 provides a lot more detailed reports at the cost of
some additional slowdown (ranging from none to, sometimes, 3x; ~3% average on
SPEC2006).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@230644 91177308-0d34-0410-b5e6-96231b3b80d8