[RFA] Fix JVMTI interpreted tests

[Keith Seitz]

Hi,

This patch addresses problems with the interpreted JVMTI testsuite that 
have crept in over the past few months. The most notable problems show 
up in the getstacktrace test, which times out during the test run.

There are a bunch of bugs that caused this, and I believe this resolves 
them all.

QCC?

Keith

ChangeLog
2007-05-23  Keith Seitz  <keiths@redhat.com>

         * include/java-interp.h (_Jv_InterpFrame::get_pc): Only deduct
         one when pc_ptr is non-NULL.

         * prims.cc (parse_init_args): Enable JVMTI with agentlib
         and agentpath options.

         * testsuite/lib/libjava.exp (exec_gij): Add new addl_flags
         parameter.
         * testsuite/libjava.jvmti/jvmti-interp.exp (gij_jvmti_test_one):
         Pass '-agentlib:dummyagent' when executing gij.
         (gij_jvmti_run): Build dummy JVMTI agent before running tests,
         and remove it when finished.
         * testsuite/libjava.jvmti/dummyagent.c: New file.
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