[analyzer] Fix SATestAdd to work with SATestBuild.

Also, eliminate global 'IsReferenceBuild' in SATestBuild. It doesn't get
passed around that much.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157816 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed