[asan] Add end-to-end tests for overflows of byval arguments.

Included is one test for passing structs by value and one test for passing C++
objects by value.

Patch by Matt Morehouse.

Differential revision: https://reviews.llvm.org/D34827

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@307343 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed