Add forgotten PL/Perl regression test files

Due to a git hook blowing up in my face telling me I could not commit
Peter Eisentraut's patch on his name, I had to "git reset" to fix the
previous commit ... and then forgot that I needed to "git add" these
files :-(

src/pl/plperl/expected/plperl_lc.out

@@ -0,0 +1,33 @@
+--
+-- Make sure strings are validated
+-- Should fail for all encodings, as nul bytes are never permitted.
+--
+CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
+  return "abcd\0efg";
+$$ LANGUAGE plperl;
+SELECT perl_zerob();
+ERROR:  invalid byte sequence for encoding "UTF8": 0x00
+CONTEXT:  PL/Perl function "perl_zerob"
+CREATE OR REPLACE FUNCTION perl_0x80_in(text) RETURNS BOOL AS $$
+  return ($_[0] eq "abc\x80de" ? "true" : "false");
+$$ LANGUAGE plperl;
+SELECT perl_0x80_in(E'abc\x80de');
+ERROR:  invalid byte sequence for encoding "UTF8": 0x80
+CREATE OR REPLACE FUNCTION perl_0x80_out() RETURNS TEXT AS $$
+  return "abc\x80de";
+$$ LANGUAGE plperl;
+SELECT perl_0x80_out() = E'abc\x80de';
+ERROR:  invalid byte sequence for encoding "UTF8": 0x80
+CREATE OR REPLACE FUNCTION perl_utf_inout(text) RETURNS TEXT AS $$
+  $str = $_[0]; $code = "NotUTF8:"; $match = "ab\xe5\xb1\xb1cd";
+  if (utf8::is_utf8($str)) {
+    $code = "UTF8:"; utf8::decode($str); $match="ab\x{5c71}cd";
+  }
+  return ($str ne $match ? $code."DIFFER" : $code."ab\x{5ddd}cd");
+$$ LANGUAGE plperl;
+SELECT encode(perl_utf_inout(E'ab\xe5\xb1\xb1cd')::bytea, 'escape')
+        encode         
+-----------------------
+ UTF8:ab\345\267\235cd
+(1 row)
+

src/pl/plperl/expected/plperl_lc_1.out

@@ -0,0 +1,41 @@
+--
+-- Make sure strings are validated
+-- Should fail for all encodings, as nul bytes are never permitted.
+--
+CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
+  return "abcd\0efg";
+$$ LANGUAGE plperl;
+SELECT perl_zerob();
+ERROR:  invalid byte sequence for encoding "SQL_ASCII": 0x00
+CONTEXT:  PL/Perl function "perl_zerob"
+CREATE OR REPLACE FUNCTION perl_0x80_in(text) RETURNS BOOL AS $$
+  return ($_[0] eq "abc\x80de" ? "true" : "false");
+$$ LANGUAGE plperl;
+SELECT perl_0x80_in(E'abc\x80de');
+ perl_0x80_in 
+--------------
+ t
+(1 row)
+
+CREATE OR REPLACE FUNCTION perl_0x80_out() RETURNS TEXT AS $$
+  return "abc\x80de";
+$$ LANGUAGE plperl;
+SELECT perl_0x80_out() = E'abc\x80de';
+ ?column? 
+----------
+ t
+(1 row)
+
+CREATE OR REPLACE FUNCTION perl_utf_inout(text) RETURNS TEXT AS $$
+  $str = $_[0]; $code = "NotUTF8:"; $match = "ab\xe5\xb1\xb1cd";
+  if (utf8::is_utf8($str)) {
+    $code = "UTF8:"; utf8::decode($str); $match="ab\x{5c71}cd";
+  }
+  return ($str ne $match ? $code."DIFFER" : $code."ab\x{5ddd}cd");
+$$ LANGUAGE plperl;
+SELECT encode(perl_utf_inout(E'ab\xe5\xb1\xb1cd')::bytea, 'escape')
+          encode          
+--------------------------
+ NotUTF8:ab\345\267\235cd
+(1 row)
+

src/pl/plperl/sql/plperl_lc.sql

@@ -0,0 +1,24 @@
+--
+-- Make sure strings are validated
+-- Should fail for all encodings, as nul bytes are never permitted.
+--
+CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
+  return "abcd\0efg";
+$$ LANGUAGE plperl;
+SELECT perl_zerob();
+CREATE OR REPLACE FUNCTION perl_0x80_in(text) RETURNS BOOL AS $$
+  return ($_[0] eq "abc\x80de" ? "true" : "false");
+$$ LANGUAGE plperl;
+SELECT perl_0x80_in(E'abc\x80de');
+CREATE OR REPLACE FUNCTION perl_0x80_out() RETURNS TEXT AS $$
+  return "abc\x80de";
+$$ LANGUAGE plperl;
+SELECT perl_0x80_out() = E'abc\x80de';
+CREATE OR REPLACE FUNCTION perl_utf_inout(text) RETURNS TEXT AS $$
+  $str = $_[0]; $code = "NotUTF8:"; $match = "ab\xe5\xb1\xb1cd";
+  if (utf8::is_utf8($str)) {
+    $code = "UTF8:"; utf8::decode($str); $match="ab\x{5c71}cd";
+  }
+  return ($str ne $match ? $code."DIFFER" : $code."ab\x{5ddd}cd");
+$$ LANGUAGE plperl;
+SELECT encode(perl_utf_inout(E'ab\xe5\xb1\xb1cd')::bytea, 'escape')