Add a scudo_unit_tests target for building the scudo unit tests.

This depends on two LLVM changes out for review:
https://reviews.llvm.org/D70471
https://reviews.llvm.org/D70472

Bug: 135772972
Change-Id: I9d6bcbba50b00bf1b47701b5a0729f3c58c6ae74
1 file changed