invoke vs. invokeStatic -> de-duplication of stacktrace frames (Clojure 1.8.0+)

[venantius]

Changes in the Clojure compiler between 1.7 and 1.8 introduced additional stack frames on certain Clojure function calls (going from .invoke to both .invoke and .invokeStatic). For example:

    pyro.core_test/fn (core_test.clj:7)
    clojure.test$test_var$fn__7983.invoke (test.clj:716)
    clojure.test$test_var.invokeStatic (test.clj:716)
    clojure.test$test_var.invoke (test.clj:707)
    pyro.core_test$sample_failure.invokeStatic (core_test.clj:7)
    pyro.core_test$sample_failure.invoke (core_test.clj:7)

This doesn't really add much to a Pyro stacktrace other than just pointing to the same line multiple times:

    pyro.core-test/fn (core_test.clj:7)
    5    (def sample-var)
    6
--> 7    (deftest ^:demo sample-failure
    8      (is (some? (dummy-fns/i-dont-work)))
    9      "this

    pyro.core-test/sample-failure (core_test.clj:7)
    5    (def sample-var)
    6
--> 7    (deftest ^:demo sample-failure
    8      (is (some? (dummy-fns/i-dont-work)))
    9      "this

    pyro.core-test/sample-failure (core_test.clj:7)
    5    (def sample-var)
    6
--> 7    (deftest ^:demo sample-failure
    8      (is (some? (dummy-fns/i-dont-work)))
    9      "this

We might want to de-duplicate these frames since they don't really add much to someone's understanding of the trace.