Copy over the ASM_DECLARE_FUNCTION_SIZE macro from linux64.h. This macro declares the proper size of a function. Without this macro recent GNU as will complain about with: 'Error: .size expression for main does not evaluate to a constant.'
Copy over the ASM_DECLARE_FUNCTION_SIZE macro from linux64.h. This macro
declares the proper size of a function. Without this macro recent GNU as will
complain about with:
'Error: .size expression for main does not evaluate to a constant.'

Up to now we produce this:

.L.main:
 	....
	.size   main, .-main

With the macro defined the output is this:

.L.main:
 	....
	.size   main,.-.L.main

This affects only the 64-bit compiler.
Tested with world and kernel on both, 32 and 64-bit powerpc.

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