Clear CompiledTritonKernel cache after each inductor compile (pytorch#146925)

Fix a bug introduced by D69123174: because triton kernels now are returned directly by the worker, each future created by the triton kernel should only be used once per compile. Otherwise, a long running process that does something like in :

```
compiled_1 = torch.compile("max-autotune", fullgraph=True)(fn)
# run compiled_1
out_compiled = compiled_1
compiled_2 = torch.compile("max-autotune", fullgraph=True)(fn2)
```

Where fn1 and fn2 are very similar (i.e. would generate the same triton kernel source code) would result in us using the launcher for the first autotuning run, and setting the launcher to None after running, and then using the same future/kernel again without regenerating the launcher.

Found this bug testing internal inference models.

This does not remove the caching support for @eellison's caching for prologue benchmarking, because that happens under the same compile: pytorch#143408

Differential Revision: [D69476856](https://our.internmc.facebook.com/intern/diff/D69476856/)

**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D69476856/)!

Pull Request resolved: pytorch#146925
Approved by: https://github.com/laithsakka, https://github.com/jansel
ghstack dependencies: pytorch#146417

Author: jamesjwu

torch/_inductor/compile_fx.py

@@ -821,11 +821,14 @@ def _compile_fx_inner(
                 },
                 payload_fn=lambda: json.dumps(cache_info),
             )
-
         compiled_graph.post_compile(example_inputs, cudagraphs, constants)
 
     log.debug("FX codegen and compilation took %.3fs", time.time() - start)
 
+    # Clear Compiled Triton Kernels per inductor compile, as the future objects
+    # may not be valid for use after they are run/autotuned
+    torch._inductor.async_compile.CompiledTritonKernels.cache_clear()
+
     _step_logger()(
         logging.INFO,
         "torchinductor done compiling "