Sync libiberty sources with master version in gcc repository. Updated stabs demangling and cxxfilt tests to match.

PR 24044
	* stabs.c (parse_stab_argtypes): Remove call to
	cplus_mangle_opcode.
	* testsuite/binutils-all/cxxfilt.exp: Replace tests of v2 encoding
	with v3 encoding.  Add escape for known failures.

libiberty/ChangeLog

@@ -1,3 +1,17 @@
+2019-01-01  Jakub Jelinek  <jakub@redhat.com>
+
+	Update copyright years.
+
+2018-12-22  Jason Merrill  <jason@redhat.com>
+
+	Remove support for demangling GCC 2.x era mangling schemes.
+	* cplus-dem.c: Remove cplus_mangle_opname, cplus_demangle_opname,
+	internal_cplus_demangle, and all subroutines.
+	(libiberty_demanglers): Remove entries for ancient GNU (pre-3.0),
+	Lucid, ARM, HP, and EDG demangling styles.
+	(cplus_demangle): Remove 'work' variable.  Don't call
+	internal_cplus_demangle.
+
 2018-12-07  Nick Clifton  <nickc@redhat.com>
 
 	PR 87681
@@ -63,28 +77,18 @@
 
 	* cplus-dem.c (remember_Btype): Don't call memcpy with LEN==0.
 
-2018-08-01  Richard Earnshaw  <rearnsha@arm.com>
+2018-07-26  Martin Liska  <mliska@suse.cz>
 
-	Copy over from GCC
-	2018-07-26  Martin Liska  <mliska@suse.cz>
-
-        PR lto/86548
+	PR lto/86548
 	* make-temp-file.c (TEMP_FILE): Remove leading 'cc'.
 	(make_temp_file): Call make_temp_file_with_prefix with
-        first argument set to NULL.
+	first argument set to NULL.
 	(make_temp_file_with_prefix): Support also prefix.
 
-2018-07-18  Eli Zaretskii  <eliz@gnu.org>
+2018-07-19  Eli Zaretskii  <eliz@gnu.org>
 
-	PR gdb/23434
-	* libiberty/simple-object-elf.c (ENOTSUP): If not defined by
-        errno.h, redirect ENOTSUP to ENOSYS.
-
-2018-06-19  Simon Marchi  <simon.marchi@ericsson.com>
-
-	* configure.ac: Remove AC_PREREQ.
-	* configure: Re-generate.
-	* config.in: Re-generate.
+	* simple-object-elf.c (ENOTSUP): If not defined by errno.h, redirect
+	to ENOSYS.
 
 2018-05-30  Jan Hubicka  <hubicka@ucw.cz>
 
@@ -987,8 +991,8 @@
 	* functions.texi: Regenerate.
 
 2014-12-11  Uros Bizjak  <ubizjak@gmail.com>
-            Ben Elliston  <bje@au.ibm.com>
-            Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
+	    Ben Elliston  <bje@au.ibm.com>
+	    Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
 
 	* xvasprintf.c: New file.
 	* vprintf-support.h: Likewise.