Update TestCallStdStringFunction to expected fail for gcc and account for multiple breakpoint locations.

Patch from Ashok Thirumurthi.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176357 91177308-0d34-0410-b5e6-96231b3b80d8
Fix string warning I introduced with indirect function support.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176360 91177308-0d34-0410-b5e6-96231b3b80d8