[Tarantool-patches] [PATCH luajit] test: fix fix-mips64-spare-side-exit-patching

[Sergey Kaplun via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

The aforementioned test is flaky when run under Tarantool due to not
enough room for all traces. The flushing of all traces at the start and
collecting them solves the issue.

The same issue may occur for the
<gh-6098-fix-side-exit-patching-on-arm64.test.lua>, so it is adjusted as
well.
---

Branch: https://github.com/tarantool/luajit/tree/skaplun/gh-noticket-fix-mips64-flaky-test
To reproduce, run the following command without the patch from the root
of the Tarantool repository:
| ctest --repeat-until-fail 1000 --test-dir third_party/luajit/ -R fix-mips64-spare-side-exit-patching

 .../fix-mips64-spare-side-exit-patching.test.lua             | 5 +++++
 .../gh-6098-fix-side-exit-patching-on-arm64.test.lua         | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/test/tarantool-tests/fix-mips64-spare-side-exit-patching.test.lua b/test/tarantool-tests/fix-mips64-spare-side-exit-patching.test.lua
index 703d8e69..dd9f2073 100644
--- a/test/tarantool-tests/fix-mips64-spare-side-exit-patching.test.lua
+++ b/test/tarantool-tests/fix-mips64-spare-side-exit-patching.test.lua
@@ -15,6 +15,11 @@ local MAXTRACE = 2000;
 
 test:plan(1)
 
+-- Flush all possible traces and collect them to be sure that
+-- we have enough space.
+jit.flush()
+collectgarbage()
+
 local function find_last_trace()
   local candidate = misc.getmetrics().jit_trace_num
   for traceno = candidate, MAXTRACE do
diff --git a/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64.test.lua b/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64.test.lua
index 678ac914..f5fc4681 100644
--- a/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64.test.lua
+++ b/test/tarantool-tests/gh-6098-fix-side-exit-patching-on-arm64.test.lua
@@ -9,6 +9,11 @@ local frontend = require('utils').frontend
 
 test:plan(1)
 
+-- Flush all possible traces and collect them to be sure that
+-- we have enough space.
+jit.flush()
+collectgarbage()
+
 -- The function to be tested for side exit patching:
 -- * At the beginning of the test case, the <if> branch is
 --   recorded as a root trace.
-- 
2.48.1