[XRay][compiler-rt] Remove the xray_fdr_log_printer_tool

Summary:
We can move this functionality into LLVM's tools instead, as it no
longer is strictly required for the compiler-rt testing infrastructure.
It also is blocking the successful bootstrapping of the clang compiler
due to a missing virtual destructor in one of the flag parsing library.

Since this binary isn't critical for the XRay runtime testing effort
anymore (yet), we remove it in the meantime with the hope of moving the
functionality in LLVM proper instead.

Reviewers: kpw, pelikan, rnk, seurer, eugenis

Subscribers: llvm-commits, mgorny

Differential Revision: https://reviews.llvm.org/D31926

llvm-svn: 299916