Allow the user to override the compiler used for testing
Allow the user to override the compiler used for testing

Change-Id: Ida62c2d85f541260f505c3dbd5d71a4b2a6004f4

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@204877 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