Tests

Use compiler.is_compiling() instead of deprecated _dynamo.is_compiling() #2797

Job	Run time
onnx / linux-job	4m 52s
unittests-extended / linux-job	17m 22s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	23m 19s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	21m 28s
unittests-linux (3.12, linux.12xlarge, cpu) / linux-job	22m 38s
unittests-linux (3.8, linux.12xlarge, cpu) / linux-job	23m 28s
unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	54s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	23m 18s
unittests-macos (3.10, macos-m1-stable) / macos-job	1m 36s
unittests-macos (3.12, macos-m1-stable) / macos-job	1m 38s
unittests-macos (3.11, macos-m1-stable) / macos-job	1m 38s
unittests-macos (3.9, macos-m1-stable) / macos-job	1m 38s
unittests-macos (3.8, macos-m1-stable) / macos-job	1m 36s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	3m 44s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	4m 9s
unittests-windows (3.12, windows.4xlarge, cpu) / windows-job	3m 23s
unittests-windows (3.8, windows.4xlarge, cpu) / windows-job	2m 49s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	2m 49s
unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	47s
	2h 43m 6s

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