[msan] Add source file:line to stack origin reports.

Runtime library part.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@190686 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Add source file:line to stack origin reports.

Test.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@190690 91177308-0d34-0410-b5e6-96231b3b80d8