8359126: [AIX] new test TestImplicitNullChecks.java fails

Author: TheRealMDoerr

test/hotspot/jtreg/compiler/gcbarriers/TestImplicitNullChecks.java

@@ -67,7 +67,8 @@ public static void main(String[] args) {
     }
 
     @Test
-    @IR(applyIfOr = {"UseZGC", "true", "UseG1GC", "true"},
+    @IR(applyIfPlatform = {"aix", "false"},
+        applyIfOr = {"UseZGC", "true", "UseG1GC", "true"},
         counts = {IRNode.NULL_CHECK, "1"},
         phase = CompilePhase.FINAL_CODE)
     static Object testLoad(Outer o) {

test/hotspot/jtreg/compiler/lib/ir_framework/test/IREncodingPrinter.java

@@ -65,6 +65,7 @@ public class IREncodingPrinter {
         "linux",
         "mac",
         "windows",
+        "aix",
         // vm.simpleArch
         "aarch64",
         "arm",
@@ -352,6 +353,8 @@ private boolean checkPlatform(String platform, String value) {
             os = "mac";
         } else if (Platform.isWindows()) {
             os = "windows";
+        } else if (Platform.isAix()) {
+            os = "aix";
         }
 
         String arch = "";