accel/tcg: split CpusAccel into three TCG variants

split up the CpusAccel tcg_cpus into three TCG variants:

tcg_cpus_rr (single threaded, round robin cpus)
tcg_cpus_icount (same as rr, but with instruction counting enabled)
tcg_cpus_mttcg (multi-threaded cpus)

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201015143217.29337-2-cfontana@suse.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/softmmu/icount.c b/softmmu/icount.c
index 020a201..dbcd8c3 100644
--- a/softmmu/icount.c
+++ b/softmmu/icount.c
@@ -396,7 +396,7 @@
 
 void icount_account_warp_timer(void)
 {
-    if (!icount_enabled() || !icount_sleep) {
+    if (!icount_sleep) {
         return;
     }