Handle is_legacy_mode in LLDPerformanceTestsuite.

git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@375336 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/zorg/buildbot/builders/LLDPerformanceTestsuite.py b/zorg/buildbot/builders/LLDPerformanceTestsuite.py
index a952d08..e3743f2 100644
--- a/zorg/buildbot/builders/LLDPerformanceTestsuite.py
+++ b/zorg/buildbot/builders/LLDPerformanceTestsuite.py
@@ -50,6 +50,10 @@
             env=merged_env,
             **kwargs) # Pass through all the extra arguments.
 
+    # Consume is_legacy_mode if given.
+    # TODO: Remove this once legacy mode gets dropped.
+    kwargs.pop('is_legacy_mode', None)
+
     if targets:
         step_name = "build-%s" % ("-".join(targets))
         step_description=["Build"]