[benchmark] Benchmark_Driver: Correctly set SWIFT_DETERMINISTIC_HASHING

Author: lorentey

benchmark/scripts/Benchmark_Driver

@@ -56,6 +56,11 @@ class BenchmarkDriver(object):
         """
         self.args = args
         self.run_env = os.environ.copy()
+
+        # Set a constant hash seed. Some tests are highly sensitive to
+        # fluctuations in the number of hash collisions.
+        self.run_env["SWIFT_DETERMINISTIC_HASHING"] = "1"
+
         if hasattr(args, 'libdir') and args.libdir:
             # The benchmark binaries should pick up the built swift libraries
             # automatically, because their RPATH should point to ../lib/swift
@@ -65,15 +70,13 @@ class BenchmarkDriver(object):
                 self.run_env["DYLD_LIBRARY_PATH"] = args.libdir
             elif platform.system() == "Linux":
                 self.run_env["LD_LIBRARY_PATH"] = args.libdir
+
         self._subprocess = _subprocess or subprocess
         self.all_tests = []
         self.test_number = {}
         self.tests = tests or self._get_tests()
         self.parser = parser or LogParser()
         self.results = {}
-        # Set a constant hash seed. Some tests are currently sensitive to
-        # fluctuations in the number of hash collisions.
-        os.environ["SWIFT_DETERMINISTIC_HASHING"] = "1"
 
     def _invoke(self, cmd):
         return self._subprocess.check_output(