Select expected remote libc++ library name based on remote platform.
Select expected remote libc++ library name based on remote platform.

Select expected remote libc++ library name based on remote platform. This is
used to verify libc++ is in the loaded image list by various tests which use it.

Test Plan:
Passes the following tests mac -> linux with this patch:
TestDataFormatterLibccIterator.py
TestDataFormatterLibccMap.py
TestDataFormatterLibccMultiMap.py
TestDataFormatterLibcxxMultiSet.py
TestDataFormatterLibcxxSet.py
TestDataFormatterUnordered.py

Differential Revision: http://reviews.llvm.org/D9759


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@237288 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb