[FYI] Use pulongest in aarch64-linux-tdep.c

[Tom Tromey <tom@tromey.com>]

While testing a patch on the buildbot, I got this error:

../../binutils-gdb/gdb/aarch64-linux-tdep.c: In function uint64_t aarch64_linux_core_read_vq(gdbarch*, bfd*):
../../binutils-gdb/gdb/aarch64-linux-tdep.c:285:29: error: format %ld expects argument of type long int, but argument 2 has type uint64_t {aka long long unsigned int} [-Werror=format=]

This patch avoids the problem by using pulongest rather than %ld.
This seems safe to me because, if aarch64-linux-tdep.c is included in
the build, then ULONGEST must be a 64-bit type.

gdb/ChangeLog
2018-08-15  Tom Tromey  <tom@tromey.com>

	* aarch64-linux-tdep.c (aarch64_linux_core_read_vq): Use pulongest.
---
 gdb/ChangeLog            | 4 ++++
 gdb/aarch64-linux-tdep.c | 5 +++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d16920d80e9..9fac8ccf5f4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2018-08-15  Tom Tromey  <tom@tromey.com>
+
+	* aarch64-linux-tdep.c (aarch64_linux_core_read_vq): Use pulongest.
+
 2018-08-14  Jan Vrany  <jan.vrany@fit.cvut.cz>
 
 	* mi/mi-cmd-disas.c (mi_cmd_disassemble): Add -a option.
diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 99e6a1590b8..389f4f494ec 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -282,12 +282,13 @@ aarch64_linux_core_read_vq (struct gdbarch *gdbarch, bfd *abfd)
   if (vq > AARCH64_MAX_SVE_VQ)
     {
       warning (_("SVE Vector length in core file not supported by this version"
-		 " of GDB.  (VQ=%ld)"), vq);
+		 " of GDB.  (VQ=%s)"), pulongest (vq));
       return 0;
     }
   else if (vq == 0)
     {
-      warning (_("SVE Vector length in core file is invalid. (VQ=%ld"), vq);
+      warning (_("SVE Vector length in core file is invalid. (VQ=%s"),
+	       pulongest (vq));
       return 0;
     }
 
-- 
2.17.1