test: Re-enable javac/dx failing checker tests for Long.compare

Previously a few tests were disabled because desugar would turn
Long.compare into lcmp. Re-enable these tests after downstreaming
new desugar with the fixes.

Bug: 36902714
Change-Id: I8b1222b3fa52d6969bc3c2c311e95bf3758a8dec
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 3edb0a8..53611a8 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -600,15 +600,6 @@
     },
     {
         "tests": [
-            "567-checker-compare",
-            "988-method-trace"
-        ],
-        "description": "Checker tests fail because desugar lowers Long.compare to lcmp",
-        "env_vars": {"ANDROID_COMPILE_WITH_JACK": "false"},
-        "bug": "b/63078894"
-    },
-    {
-        "tests": [
             "536-checker-needs-access-check",
             "537-checker-inline-and-unverified",
             "569-checker-pattern-replacement",