Hi, Sergey

thanks for the patch!

This patch moves the aforementioned test from the <misc> to the <trace/>
directory, includes it in <index>, and names subtests.

The first test is adjusted to be runable in the test suite.

Part of tarantool/tarantool#9398
---
 .../{misc/gc_trace.lua => trace/gc.lua}       | 27 +++++++++----------
 test/LuaJIT-tests/trace/index                 |  1 +
 2 files changed, 14 insertions(+), 14 deletions(-)
 rename test/LuaJIT-tests/{misc/gc_trace.lua => trace/gc.lua} (60%)

diff --git a/test/LuaJIT-tests/misc/gc_trace.lua b/test/LuaJIT-tests/trace/gc.lua
similarity index 60%
rename from test/LuaJIT-tests/misc/gc_trace.lua
rename to test/LuaJIT-tests/trace/gc.lua
index bc38ce0c..4d984ed6 100644
--- a/test/LuaJIT-tests/misc/gc_trace.lua
+++ b/test/LuaJIT-tests/trace/gc.lua
@@ -1,18 +1,18 @@
+local jutil = require("jit.util")
 
-if not jit or not jit.status or not jit.status() then return end
-
-collectgarbage()
-for j=1,100 do
-  loadstring("for i=1,100 do end")()
+do --- Collect dead traces.
+  jit.flush()
+  collectgarbage()
+  for _ = 1, 100 do
+    loadstring("for _ = 1, 100 do end")()
+  end
+  collectgarbage()
+  assert(jutil.traceinfo(1) == nil)
+  assert(jutil.traceinfo(2) == nil)
+  assert(jutil.traceinfo(3) == nil)
 end
-local jutil = require("jit.util")
-assert(jutil.traceinfo(90) == nil)
-collectgarbage()
-assert(jutil.traceinfo(1) == nil)
-assert(jutil.traceinfo(2) == nil)
-assert(jutil.traceinfo(3) == nil)
 
-do
+do --- Check KGC marking.
   local f
   local function reccb(tr)
     if f == nil then
@@ -24,7 +24,7 @@ do
     end
   end
   jit.attach(reccb, "record")
-  for i=1,200 do
+  for i = 1, 200 do
     if i % 5 == 0 then
       f = function() end
     elseif f then
@@ -34,4 +34,3 @@ do
   end
   jit.attach(reccb)
 end
-
diff --git a/test/LuaJIT-tests/trace/index b/test/LuaJIT-tests/trace/index
index ea7a22e0..46c8f5d2 100644
--- a/test/LuaJIT-tests/trace/index
+++ b/test/LuaJIT-tests/trace/index
@@ -1,6 +1,7 @@
 exit_frame.lua
 exit_growstack.lua
 exit_jfuncf.lua
+gc.lua
 gc64_slot_revival.lua
 phi
 snap.lua