Change linker from lld to gold for builder. (#347)

When I originally adder this builder, I'm not sure why I changed the
linker to be lld, it should be gold to match our previous instance. This
change fixes that.

Author: dyung

buildbot/osuosl/master/config/builders.py

@@ -1085,7 +1085,7 @@
                         "-DLLVM_ENABLE_ASSERTIONS=OFF",
                         "-DLLVM_INCLUDE_EXAMPLES=OFF",
                         "-DLLVM_LIT_ARGS=--verbose",
-                        "-DLLVM_USE_LINKER=lld"])},
+                        "-DLLVM_USE_LINKER=gold"])},
 
 # Polly builders.