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remove #[no_mangle] from panic handler #773

Job	Run time
Test (windows-latest)	4m 34s
Test (macos-latest)	1m 29s
Test (ubuntu-latest)	1m 38s
Build Example Kernel (macos-latest)	36s
Build Example Kernel (ubuntu-latest)	31s
Check Formatting	19s
Build Example Kernel (windows-latest)	31s
	9m 38s

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