RFR (T) 8214004: Missing space between compiler thread name and task info in hs_err

[Aleksey Shipilev]

RFE:
  https://bugs.openjdk.java.net/browse/JDK-8214004

Compiler thread name is actually "CompilerThread0" here:

  Threads with active compile tasks:
  C2 CompilerThread01391 b sun.nio.cs.StandardCharsets$Aliases::init (6328 bytes)

Trivial fix:

diff -r dd2e91ddf44d -r 85d67a2961a2 src/hotspot/share/runtime/thread.cpp
--- a/src/hotspot/share/runtime/thread.cpp      Fri Nov 16 17:23:08 2018 +0100
+++ b/src/hotspot/share/runtime/thread.cpp      Fri Nov 16 18:05:06 2018 +0100
@@ -4691,6 +4691,7 @@
       CompileTask* task = ct->task();
       if (task != NULL) {
         thread->print_name_on_error(st, buf, buflen);
+        st->print("  ");
         task->print(st, NULL, true, true);
       }
     }

Testing: eyeballing hs_errs

Thanks,
-Aleksey