Run benchmarks with experimental splitting.

This includes:
 - add vm args to graalpythonvm
 - add experimental splitting configuration

Author: boris-spas

ci.jsonnet

@@ -1,5 +1,5 @@
 {
-  overlay: "9a364f9b9ae34629919679b5edefb803ad27fbb7",
+  overlay: "09dd9dc962677472fb7582a8f9ce2054ab4ae14f",
 
   // ======================================================================================================
   // 

mx.graalpython/mx_graalpython.py

@@ -38,7 +38,7 @@
 from mx_gate import Task
 from mx_graalpython_bench_param import PATH_MESO, BENCHMARKS
 from mx_graalpython_benchmark import PythonBenchmarkSuite, python_vm_registry, CPythonVm, PyPyVm, GraalPythonVm, \
-    CONFIGURATION_DEFAULT
+    CONFIGURATION_DEFAULT, CONFIGURATION_EXPERIMENTAL_SPLITTING
 from mx_unittest import unittest
 
 SUITE = mx.suite('graalpython')
@@ -826,6 +826,10 @@ def _register_vms(namespace):
     python_vm_registry.add_vm(CPythonVm(CONFIGURATION_DEFAULT), SUITE)
     python_vm_registry.add_vm(PyPyVm(CONFIGURATION_DEFAULT), SUITE)
     python_vm_registry.add_vm(GraalPythonVm(config_name=CONFIGURATION_DEFAULT), SUITE, 10)
+    python_vm_registry.add_vm(GraalPythonVm(config_name=CONFIGURATION_EXPERIMENTAL_SPLITTING, extra_vm_args=[
+        '-Dgraal.TruffleExperimentalSplitting=true',
+        '-Dgraal.TruffleExperimentalSplittingAllowForcedSplits=false'
+    ]), SUITE, 10)
 
 
 def _register_bench_suites(namespace):

mx.graalpython/mx_graalpython_benchmark.py

@@ -54,6 +54,7 @@
 SUBGROUP_GRAAL_PYTHON = "graalpython"
 PYTHON_VM_REGISTRY_NAME = "Python"
 CONFIGURATION_DEFAULT = "default"
+CONFIGURATION_EXPERIMENTAL_SPLITTING = "experimental_splitting"
 
 DEFAULT_ITERATIONS = 10
 
@@ -186,12 +187,13 @@ def name(self):
 
 class GraalPythonVm(GuestVm):
     def __init__(self, config_name=CONFIGURATION_DEFAULT, distributions=None, cp_suffix=None, cp_prefix=None,
-                 host_vm=None):
+                 host_vm=None, extra_vm_args=None):
         super(GraalPythonVm, self).__init__(host_vm=host_vm)
         self._config_name = config_name
         self._distributions = distributions
         self._cp_suffix = cp_suffix
         self._cp_prefix = cp_prefix
+        self._extra_vm_args = extra_vm_args
 
     def hosting_registry(self):
         return java_vm_registry
@@ -215,6 +217,8 @@ def run(self, cwd, args):
                 dists.append('SULONG_MANAGED')
 
         vm_args = mx.get_runtime_jvm_args(dists, cp_suffix=self._cp_suffix, cp_prefix=self._cp_prefix)
+        if isinstance(self._extra_vm_args, list):
+            vm_args += self._extra_vm_args
         vm_args += [
             "-Dpython.home=%s" % join(SUITE.dir, "graalpython"),
             "com.oracle.graal.python.shell.GraalPythonMain"