test-release.sh: Run the test-suite using phase3 clang

Summary: We were using the system compiler to run the test suite.

Reviewers: hansw

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D34246

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305525 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed