* src/threads/none/threads.h [!defined(NDEBUG)] (_no_threads_tracejavacallindent, _no_threads_tracejavacallcount, TRACEJAVACALLINDENT, TRACEJAVACALLCOUNT): added.
* src/threads/native/threads.h [!defined(NDEBUG)] (threadinfo): Added tracejavacallindent, tracejavacallcount members. (TRACEJAVACALLINDENT, TRACEJAVACALLCOUNT): added.
* src/threads/native/threads.c: Likewise.
* src/vm/jit/trace.h New file.
* src/vm/jit/trace.c: Likewise.
* src/vm/jit/Makefile.am (libjit_la_SOURCES): added trace.h and trace.c.
* src/vm/jit/s390/emit.c (emit_verbosecall_enter): adpated to use trace_java_call_enter, (emit_verbosecall_exit): adapted to use trace_java_call_exit.