[Bug 191981] New: [patch] [libproc] demangle() fail to handle non-c++ function name

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191981

            Bug ID: 191981
           Summary: [patch] [libproc] demangle() fail to handle non-c++
                    function name
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: luke.tw at gmail.com

Created attachment 144809
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=144809&action=edit
patch for demangle() to handle c function name

* root cause
   demangle() in lib/libproc/proc_sym.c only handles c++ function, but ignores
c function. 
   This bug causes that ustack() in dtrace cannot print c function name. 

* solution
   We should restore the behavior before revision r268463 . Please see the
attached patch.

* =======  before patch ==============================
 # dtrace -n 'pid$target:::entry{ustack()}' -c ./a.out
dtrace: description 'pid$target:::entry' matched 3009 probes
CPU     ID                    FUNCTION:NAME
  3  55874          _r_debug_postinit:entry
              ld-elf.so.1`????+0x1
              ld-elf.so.1`0x800603f1c
              ld-elf.so.1`0x800602139

  3  55865                     _start:entry
              a.out` ????+0x1
              ld-elf.so.1`0x80061e000

  3  58679                     atexit:entry
              libc.so.7`????+0x1
              a.out`????+0x6d
              ld-elf.so.1`0x80061e000

  3  55867                       main:entry
              a.out`????+0x1
              a.out`????+0x16f
              ld-elf.so.1`0x80061e000

* =======  after patch ==============================
 # dtrace -n 'pid$target:::entry{ustack()}' -c ./a.out
dtrace: description 'pid$target:::entry' matched 3009 probes
CPU     ID                    FUNCTION:NAME
  2  55874          _r_debug_postinit:entry
              ld-elf.so.1`_r_debug_postinit+0x1
              ld-elf.so.1`0x800603f1c
              ld-elf.so.1`0x800602139

  2  55865                     _start:entry
              a.out`_start+0x1
              ld-elf.so.1`0x80061e000

  2  58679                     atexit:entry
              libc.so.7`atexit+0x1
              a.out`_start+0x6d
              ld-elf.so.1`0x80061e000

  2  55867                       main:entry
              a.out`main+0x1
              a.out`_start+0x16f
              ld-elf.so.1`0x80061e000

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