[eacsl] Add test for issue e-acsl#166

src/plugins/e-acsl/tests/bts/issue-eacsl-166.i

+/* run.config
+   COMMENT: Change order of options to run Eva before E-ACSL so that the ensures
+   COMMENT: clause is proven invalid before running E-ACSL. Eva will prove the
+   COMMENT: ensures invalid under hypotheses of reachability, this test shows
+   COMMENT: that when we duplicate the invalid property statuses, we remove the
+   COMMENT: hypotheses to satisfy kernel invariants.
+   OPT: @GLOBAL@ @EVA@ -then @EACSL@ -then-last @EVENTUALLY@
+*/
+/* run.config_dev
+   COMMENT: No need to compile and execute the test since we know the property
+   COMMENT: will be invalid.
+   DONTRUN:
+*/
+
+/*@ ensures \result == 1; */
+int f() {
+  return 0;
+}
+
+int main() {
+  f();
+  return 0;
+}

src/plugins/e-acsl/tests/bts/oracle/issue-eacsl-166.res.oracle

+[eva:alarm] tests/bts/issue-eacsl-166.i:15: Warning: 
+  function f: postcondition got status invalid.
+[e-acsl] beginning translation.
+[e-acsl] translation done in project "e-acsl".
+[eva:alarm] tests/bts/issue-eacsl-166.i:15: Warning: 
+  function __e_acsl_assert, behavior blocking: precondition got status invalid.