libgo: redefine ia64 struct names around linux/ptrace.h

    
    Avoid https://sourceware.org/bugzilla/show_bug.cgi?id=762.
    
    Patch by Andreas Schwab.
    
    Reviewed-on: https://go-review.googlesource.com/46711

From-SVN: r249662

gcc/go/gofrontend/MERGE

-0a20181d00d43a423c55f4e772b759fba0619478
+1b4c2bcaa96f7f40538fd8fff308ad92ea6f482e
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/sysinfo.c

@@ -103,7 +103,12 @@
 #include <linux/netlink.h>
 #endif
 #if defined(HAVE_LINUX_PTRACE_H)
+/* Avoid https://sourceware.org/bugzilla/show_bug.cgi?id=762 .  */
+#define ia64_fpreg pt_ia64_fpreg
+#define pt_all_user_regs pt_ia64_all_user_regs
 #include <linux/ptrace.h>
+#undef ia64_fpreg
+#undef pt_all_user_regs
 #endif
 #if defined(HAVE_LINUX_RTNETLINK_H)
 #include <linux/rtnetlink.h>