[Bugfix] Avoid OpenMP thread reallocation in CPU torch compile (#37391)

Signed-off-by: jiang1.li <jiang1.li@intel.com>
(cherry picked from commit 26180124)

vllm/platforms/cpu.py

@@ -246,6 +246,7 @@ class CpuPlatform(Platform):
                     "size_asserts": False,
                     "nan_asserts": False,
                     "epilogue_fusion": True,
+                    "cpp.dynamic_threads": True,
                 }
             )