Bug 1429056 - Add llvm-symbolizer to the llvm-dsymutil toolchain. r=ted

llvm-symbolizer is necessary to get symbols in llvm-dsymutil crash
dumps. While we could use the one from clang during the build, it's
better if the llvm-dsymutil toolchain is standalone for local testing.

--HG--
extra : rebase_source : 5cd234a3e14ab52a4ce759821e0e756e68167797

taskcluster/scripts/misc/build-llvm-dsymutil.sh

@@ -28,9 +28,9 @@ cmake \
 
 export LD_LIBRARY_PATH=$HOME_DIR/src/gcc/lib64
 
-ninja llvm-dsymutil
+ninja llvm-dsymutil llvm-symbolizer
 
-tar --xform='s,^,llvm-dsymutil/,' -Jcf llvm-dsymutil.tar.xz bin/llvm-dsymutil
+tar --xform='s,^,llvm-dsymutil/,' -Jcf llvm-dsymutil.tar.xz bin/llvm-dsymutil bin/llvm-symbolizer
 
 mkdir -p $UPLOAD_DIR
 cp llvm-dsymutil.tar.xz $UPLOAD_DIR