[compiler-rt] Fix cmake to propagate debug info to runtime unittests
[compiler-rt] Fix cmake to propagate debug info to runtime unittests

Summary:
The debug information is not present due to a mis named variabl in 
the cmake files.

Reviewers: rnk

Subscribers: kubabrecka, wang0109, llvm-commits, chrisha

Differential Revision: http://reviews.llvm.org/D21938

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@274386 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt