8028160: [TESTBUG] Exclude failing (runtime) jtreg tests using @ignore

Use @ignore to exclude failing tests

Reviewed-by: coleenp, ctornqvi, mseledtsov

hotspot/test/runtime/6626217/Test6626217.sh

@@ -21,7 +21,8 @@
 #  questions.
 # 
 
- 
+
+# @ignore 8028733
 # @test @(#)Test6626217.sh
 # @bug 6626217
 # @summary Loader-constraint table allows arrays instead of only the base-classes

hotspot/test/runtime/6929067/Test6929067.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 ##
+## @ignore 8028740
 ## @test Test6929067.sh
 ## @bug 6929067
 ## @bug 8021296

hotspot/test/runtime/CDSCompressedKPtrs/XShareAuto.java

@@ -22,6 +22,7 @@
  */
 
 /*
+ * @ignore 8026154
  * @test
  * @bug 8005933
  * @summary Test that -Xshare:auto uses CDS when explicitly specified with -server.

hotspot/test/runtime/InitialThreadOverflow/testme.sh

@@ -21,6 +21,7 @@
 # or visit www.oracle.com if you need additional information or have any
 # questions.
 
+# @ignore 8029139
 # @test testme.sh
 # @bug 8009062
 # @summary Poor performance of JNI AttachCurrentThread after fix for 7017193

hotspot/test/runtime/LoadClass/LoadClassNegative.java

@@ -22,6 +22,7 @@
  */
 
 /*
+ * @ignore 8028095
  * @test
  * @key regression
  * @bug 8020675

hotspot/test/runtime/XCheckJniJsig/XCheckJSig.java

@@ -22,6 +22,7 @@
  */
 
 /*
+ * @ignore 8023735
  * @test
  * @bug 7051189 8023393
  * @summary Need to suppress info message if -Xcheck:jni is used with libjsig.so

hotspot/test/runtime/jsig/Test8017498.sh

@@ -24,6 +24,7 @@
 #
 
 ##
+## @ignore 8028806
 ## @test Test8017498.sh
 ## @bug 8017498
 ## @bug 8020791

hotspot/test/runtime/memory/ReadFromNoaccessArea.java

@@ -22,6 +22,7 @@
  */
 
 /*
+ * @ignore 8028398
  * @test
  * @summary Test that touching noaccess area in class ReservedHeapSpace results in SIGSEGV/ACCESS_VIOLATION
  * @library /testlibrary /testlibrary/whitebox