[Bug 223553] bsdgrep in -current is 10 times slower than before

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223553

            Bug ID: 223553
           Summary: bsdgrep in -current is 10 times slower than before
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wosch at FreeBSD.org

While working on bug #223532 I noticed that bsdgrep on a recent
FreeBSD12-current is much slower than on FreeBSD11-stable

On both machines runs the same bsdgrep version 2.6.0
$ /usr/bin/bsdgrep -V
bsdgrep (BSD grep, GNU compatible) 2.6.0-FreeBSD

How to repeat:

First, we create a 100MB text file:
for i in $(seq 1 20);do man tcsh;done > /tmp/tcsh20;
for i in $(seq 1 20); do cat /tmp/tcsh20;done > /tmp/tcsh400

$ du -hs /tmp/tcsh400
 99M    /tmp/tcsh400

# FreeBSD11-stable
LANG=en_CA.UTF-8 time /usr/bin/bsdgrep  -ic  foobar /tmp/tcsh400
0
        2.06 real         2.00 user         0.05 sys


# FreeBSD12-current 
LANG=en_CA.UTF-8 time /usr/bin/bsdgrep  -ic  foobar /tmp/tcsh400
0
       19.27 real        19.17 user         0.05 sys

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