Move arm.passes to arm._passes (#5918)

Summary:
Changing arm.passes to arm._passes to indicate that these passes are not covered under the API stability guarantee.

Pull Request resolved: #5918

Reviewed By: malfet, helunwencser

Differential Revision: D63926055

fbshipit-source-id: 141a5be9f3a81e75784825357bacbab91904620c

Author: tarun292

backends/arm/TARGETS

@@ -8,7 +8,7 @@ python_library(
     typing = True,
     deps = [
         ":arm_backend",
-        "//executorch/backends/arm/passes:passes",
+        "//executorch/backends/arm/_passes:passes",
         "//executorch/exir:lib",
     ],
 )
@@ -27,7 +27,7 @@ python_library(
         ":arm_vela",
         "//executorch/backends/arm/operators:lib",
         "//executorch/backends/arm/operators:node_visitor",
-        "//executorch/backends/arm/passes:passes",
+        "//executorch/backends/arm/_passes:passes",
     ],
 )
 

backends/arm/passes/TARGETS renamed to backends/arm/_passes/TARGETS

@@ -8,25 +8,25 @@
 # pyre-unsafe
 
 import torch
-from executorch.backends.arm.passes.annotate_channels_last_dim_order_pass import (
+from executorch.backends.arm._passes.annotate_channels_last_dim_order_pass import (
     AnnotateChannelsLastDimOrder,
 )
-from executorch.backends.arm.passes.cast_int64_pass import CastInt64ToInt32Pass
-from executorch.backends.arm.passes.convert_expand_copy_to_repeat import (
+from executorch.backends.arm._passes.cast_int64_pass import CastInt64ToInt32Pass
+from executorch.backends.arm._passes.convert_expand_copy_to_repeat import (
     ConvertExpandCopyToRepeatPass,
 )
-from executorch.backends.arm.passes.convert_split_to_slice import (
+from executorch.backends.arm._passes.convert_split_to_slice import (
     ConvertSplitToSlicePass,
 )
-from executorch.backends.arm.passes.decompose_div_pass import DecomposeDivPass
-from executorch.backends.arm.passes.meandim_to_averagepool_pass import (
+from executorch.backends.arm._passes.decompose_div_pass import DecomposeDivPass
+from executorch.backends.arm._passes.meandim_to_averagepool_pass import (
     ConvertMeanDimToAveragePool,
 )
-from executorch.backends.arm.passes.remove_clone_pass import RemoveClonePass
-from executorch.backends.arm.passes.scalars_to_attribute_pass import (
+from executorch.backends.arm._passes.remove_clone_pass import RemoveClonePass
+from executorch.backends.arm._passes.scalars_to_attribute_pass import (
     ScalarsToAttributePass,
 )
-from executorch.backends.arm.passes.size_adjust_conv2d_pass import SizeAdjustConv2DPass
+from executorch.backends.arm._passes.size_adjust_conv2d_pass import SizeAdjustConv2DPass
 from executorch.exir import ExportedProgram
 from executorch.exir.backend.compile_spec_schema import CompileSpec
 from executorch.exir.pass_manager import PassManager

backends/arm/passes/annotate_channels_last_dim_order_pass.py renamed to backends/arm/_passes/annotate_channels_last_dim_order_pass.py

@@ -7,7 +7,7 @@
 # pyre-unsafe
 
 import torch.fx
-from executorch.backends.arm.passes.arm_pass_utils import create_node
+from executorch.backends.arm._passes.arm_pass_utils import create_node
 from executorch.backends.arm.tosa_mapping import extract_tensor_meta
 from executorch.exir.dialects._ops import ops as exir_ops
 from executorch.exir.pass_base import ExportPass, PassResult