Move cpu_has_work and cpu_pc_from_tb to cpu.h

Move functions cpu_has_work() and cpu_pc_from_tb() from exec.h to cpu.h. This is
needed by later patches.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index b5e587f..d48a9b7 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -962,4 +962,15 @@
     cpu_interrupt(env, CPU_INTERRUPT_HARD);
 }
 
+static inline bool cpu_has_work(CPUState *env)
+{
+    return (env->interrupt_request & CPU_INTERRUPT_HARD) &&
+        (env->psw.mask & PSW_MASK_EXT);
+}
+
+static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock* tb)
+{
+    env->psw.addr = tb->pc;
+}
+
 #endif