[IR Framework] Some default regexes matching on PrintOptoAssembly in IRNode.java do not work on all platforms

Have been seen only in aarch64 so far.

Please find workdir and .jtr files attached. The stacktrace (though it looks not very informative):

java.lang.RuntimeException: Method fail6(), Rule 1 with "failOn" should have failed at Regex 2: expected true, was false
        at jdk.test.lib.Asserts.fail(Asserts.java:594)
        at jdk.test.lib.Asserts.assertTrue(Asserts.java:486)
        at ir_framework.tests.RegexConstraint.checkIRRule(TestIRMatching.java:1535)
        at ir_framework.tests.Constraint.checkConstraint(TestIRMatching.java:1399)
        at ir_framework.tests.TestIRMatching.checkConstraints(TestIRMatching.java:279)
        at ir_framework.tests.TestIRMatching.runCheck(TestIRMatching.java:271)
        at ir_framework.tests.TestIRMatching.main(TestIRMatching.java:59)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
        at java.base/java.lang.Thread.run(Thread.java:833)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Method fail6(), Rule 1 with "failOn" should have failed at Regex 2: expected true, was false