[msan] LIT: Add lld testing config

Summary: A follow-up for D39508, with memory sanitizer changes.

Reviewers: eugenis, vitalybuka

Reviewed By: eugenis

Subscribers: mgorny, mehdi_amini, kcc, #sanitizers, llvm-commits

Tags: #sanitizers, #lld

Differential Revision: https://reviews.llvm.org/D40768

llvm-svn: 320514