6893701: compiler/6877254/Test.java fails because it combines -XX:+UseConcMarkSweepGC with other GC

Summary: Remove explicit GC flags in regression tests
Reviewed-by: never, ysr

test/compiler/6877254/Test.java

@@ -26,7 +26,7 @@
  * @bug 6877254
  * @summary Implement StoreCMNode::Ideal to promote its OopStore above the MergeMem
  *
- * @run main/othervm -server -Xcomp -XX:+UseConcMarkSweepGC Test
+ * @run main/othervm -Xcomp Test
  */
 
 public class Test {

test/compiler/6896727/Test.java

@@ -26,7 +26,7 @@
  * @test
  * @bug 6896727
  * @summary nsk/logging/LoggingPermission/LoggingPermission/logperm002 fails with G1, EscapeAnalisys w/o COOPs
- * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp -XX:+DoEscapeAnalysis -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC Test
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xcomp -XX:+DoEscapeAnalysis Test
  */
 
 public class Test {