workaround for jacoco

Author: timfel

mx.graalpython/mx_graalpython.py

@@ -382,6 +382,10 @@ def is_included(path):
     args += [_graalpytest_driver(), "-v"]
 
     agent_args = " ".join(mx_gate.get_jacoco_agent_args() or [])
+    # if we leave the excludes, the string is too long and it will be ignored by
+    # the JVM. See
+    # https://github.com/graalvm/graal-jvmci-8/blob/fc8a493bac33d35405c4361a134a812222c3d14b/src/share/vm/runtime/arguments.cpp#L3841
+    agent_args = re.sub("excludes=[^,]+,", "", agent_args)
     if agent_args:
         # jacoco only dumps the data on exit, and when we run all our unittests
         # at once it generates so much data we run out of heap space