RFR (trivial): 8219919: RuntimeStub's name lost with PrintFrameConverterAssembly

[Jie Fu]

Hi all,

Bug: https://bugs.openjdk.java.net/browse/JDK-8219919

The RuntimeStub's name is lost when dumping C2's runtime stub with 
-XX:+PrintFrameConverterAssembly.
However, it do exist when dumping with -XX:+PrintStubCode.

It would be more friendly if the stub's name was dumped as well for JVM 
debuggers with -XX:+PrintFrameConverterAssembly.

It can be fixed by
---------------------------------------
diff -r 56089cf6152c src/hotspot/share/opto/output.cpp
--- a/src/hotspot/share/opto/output.cpp Tue Feb 26 05:46:02 2019 -0800
+++ b/src/hotspot/share/opto/output.cpp Thu Feb 28 19:52:40 2019 +0800
@@ -1556,6 +1556,8 @@
        }
        if (method() != NULL) {
          method()->print_metadata();
+      } else if (stub_name() != NULL) {
+        tty->print_cr("Generating RuntimeStub - %s", stub_name());
        }
        dump_asm(node_offsets, node_offset_limit);
        if (xtty != NULL) {
---------------------------------------

The change has been tested on Linux/x64.
Could you please review it?
Thanks a lot.

Best regards,
Jie