[lit]Add llvm-readelf to tool substitutions

Reviewed by: rnk, alexsahp

Differential Revision: https://reviews.llvm.org/D55564


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@348921 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed