This patch changes some spots in psymtab.[ch] to use 'const'.  This is
just preparation for a subsequent patch.  Note that psymbols are
conceptually const, and since they were changed to be
objfile-indepdendent, they are truly never modified -- which is what
makes this patch reasonably short.
---
 gdb/psymtab.c | 59 ++++++++++++++++++++++++++++-------------------------------
 gdb/psymtab.h |  4 ++--
 2 files changed, 30 insertions(+), 33 deletions(-)

diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index a831e5eec40..f1aabd5b10b 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -37,18 +37,15 @@
 #include <set>
 #include "gdbsupport/buildargv.h"

This patch looks reasonable and causes no regressions for Fedora Rawhide on aarch64.