[llvm-exegesis] Fix compilation on some clang versions.

default initialization of an object of const type 'const llvm::DebugLoc' requires a user-provided default constructor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329171 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed