[XRay] Fixup: remove 'noexcept' in defaulted move members

This is to appease stage1 builds using gcc.

Follow-up to D48370.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338826 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed