[Bug 263999] Regression: truncate(2) succeeds even for text files being executed

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263999

            Bug ID: 263999
           Summary: Regression: truncate(2) succeeds even for text files
                    being executed
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

According to the man page, truncate should fail and return ETXTBUSY if "The
file is a pure procedure (shared text) file that is being executed.".  Indeed
it does on 13.0-RELEASE, 13.1-RC5, 13.1-STABLE (as of 29-Apr), and 12.3-STABLE
(as of 17-Jan).  But on 14.0-CURRENT (tested at 90161e72eec and b9e5884ef78) it
succeeds.  Tested on ZFS, UFS, and fusefs.

Steps to reproduce:
* sudo pkg install perl5
* git clone https://github.com/pjd/pjdfstest.git
* cd /tmp
* sudo prove -rv /path/to/pjdfstest/tests/truncate/11.t

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