systemtap bug fix and enhancement update

Updated systemtap packages that rebase to upstream version 1.4 are now
available for Red Hat Enterprise Linux 6.

SystemTap is an instrumentation system for systems running the Linux
kernel, version 2.6. Developers can write scripts to collect data on the
operation of the system.

With this update, SystemTap is rebased on upstream version 1.4. This
rebase features several enhancements and bug fixes compared to version 1.2.
This includes better diagnostics for backtracing, access to more kernel
tracepoints, wildcards in process("/bin/*") probes, improved sys/sdt.h
userspace markers, integrated compile-server client, and automatic
pretty-printing of structures ($variable$).

For more details on enhancements and bug fixes applied by this update,
refer to the "SystemTap" section in the Red Hat Enterprise Linux 6.1
Technical Notes:

https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/index.html

All SystemTap users are advised to apply this update.

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

607227 - Stopped systemtap initscript does not start on 'restart'
609636 - Unwinding through prelinked shared library broken (.debug_frame)
624657 - Timing issue in systemtap initscript restart command
625849 - 'ERROR: kernel read fault' during sdt probes benchmark on s390x
634995 - rebase systemtap for rhel6.1
640097 - Segfaults while probing shell spawnfest
643866 - stap script generates errors when using clone() with various namespace flags
646871 - misaddresed user-space probes on prelinked shared libraries on i686 (REL)
670647 - Markers using %rbx register incorrectly masked to low byte
671004 - user-space probes wrongly reject repnz;ret instructions
671005 - errata: missing -D__FORTIFY on some binaries
676641 - dtrace(1) man page is not in the same package as the binary
681190 - userspace tracing errors on s390x
683569 - SystemTap documentation for RHEL 6 is incorrect about the location of the debuginfo packages
690597 - systemtap sys/sdt.h probes with semaphore fail on s390
691693 - systemtap.base/bench.exp: PASS->FAIL
691750 - systemtap.printf/ring_buffer.exp: 3PASS -> 1FAIL
691760 - systemtap.stress/conversions.exp: 3PASS -> 3FAIL
692869 - syscall.nfsservctl stopped working for 6.1 kernel

https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/index.html