Update test/test_core.py

Co-authored-by: Alon Zakai <alonzakai@gmail.com>

Author: sbc100

test/test_core.py

@@ -9937,7 +9937,7 @@ def setUp(self):
 # MEMORY64=1
 wasm64 = make_run('wasm64', cflags=['--profiling-funcs'],
                   settings={'MEMORY64': 1}, require_wasm64=True)
-wasm64_O2 = make_run('wasm64', cflags=['-O2'],
+wasm64_O2 = make_run('wasm64_O2', cflags=['-O2'],
                      settings={'MEMORY64': 1}, require_wasm64=True)
 # Run the wasm64 tests with all memory offsets > 4gb.  Be careful running this test
 # suite with any kind of parallelism.