cpu: Move host_tid field to CPUState

Change gdbstub's cpu_index() argument to CPUState now that CPUArchState
is no longer used.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/dump.c b/dump.c
index 4ed1fa8..a25f509 100644
--- a/dump.c
+++ b/dump.c
@@ -271,11 +271,13 @@
 static int write_elf64_notes(DumpState *s)
 {
     CPUArchState *env;
+    CPUState *cpu;
     int ret;
     int id;
 
     for (env = first_cpu; env != NULL; env = env->next_cpu) {
-        id = cpu_index(env);
+        cpu = ENV_GET_CPU(env);
+        id = cpu_index(cpu);
         ret = cpu_write_elf64_note(fd_write_vmcore, env, id, s);
         if (ret < 0) {
             dump_error(s, "dump: failed to write elf notes.\n");
@@ -321,11 +323,13 @@
 static int write_elf32_notes(DumpState *s)
 {
     CPUArchState *env;
+    CPUState *cpu;
     int ret;
     int id;
 
     for (env = first_cpu; env != NULL; env = env->next_cpu) {
-        id = cpu_index(env);
+        cpu = ENV_GET_CPU(env);
+        id = cpu_index(cpu);
         ret = cpu_write_elf32_note(fd_write_vmcore, env, id, s);
         if (ret < 0) {
             dump_error(s, "dump: failed to write elf notes.\n");