PATCH: Check gdbarch_ptr_bit for x32 core dump

["H.J. Lu" <hongjiu.lu@intel.com>]

Hi,

This patch checks gdbarch_ptr_bit for x32 core dump.  Tested on
Linux/x86-64.  Ok to install?

Thanks.

H.J.
---
	* amd64-linux-tdep.c (amd64_linux_core_read_description): Check
	gdbarch_ptr_bit for x32 core dump.

diff --git a/gdb/amd64-linux-tdep.c b/gdb/amd64-linux-tdep.c
index acc7303..601ce20 100644
--- a/gdb/amd64-linux-tdep.c
+++ b/gdb/amd64-linux-tdep.c
@@ -1273,9 +1290,15 @@ amd64_linux_core_read_description (struct gdbarch *gdbarch,
   switch ((xcr0 & I386_XSTATE_AVX_MASK))
     {
     case I386_XSTATE_AVX_MASK:
-      return tdesc_amd64_avx_linux;
+      if (gdbarch_ptr_bit (gdbarch) == 32)
+	return tdesc_x32_avx_linux;
+      else
+	return tdesc_amd64_avx_linux;
     default:
-      return tdesc_amd64_linux;
+      if (gdbarch_ptr_bit (gdbarch) == 32)
+	return tdesc_x32_linux;
+      else
+	return tdesc_amd64_linux;
     }
 }