meson: convert the speed tests

Use meson benchmark() for them, adjust mtest2make.py for that.
A new target "make bench" can be used to run all benchmarks.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20200828110734.1638685-14-marcandre.lureau@redhat.com>
[Rewrite mtest2make part. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/scripts/mtest2make.py b/scripts/mtest2make.py
index af6dd0d..9cbb2e3 100644
--- a/scripts/mtest2make.py
+++ b/scripts/mtest2make.py
@@ -103,10 +103,17 @@
     print('endif')
 
 testsuites = defaultdict(Suite)
-for test in introspect:
+for test in introspect['tests']:
     process_tests(test, testsuites)
 emit_prolog(testsuites, 'check')
 for name, suite in testsuites.items():
     emit_suite(name, suite, 'check')
 
+benchsuites = defaultdict(Suite)
+for test in introspect['benchmarks']:
+    process_tests(test, benchsuites)
+emit_prolog(benchsuites, 'bench')
+for name, suite in benchsuites.items():
+    emit_suite(name, suite, 'bench')
+
 print('run-tests: $(patsubst %, run-test-%, $(.tests))')