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[PATCH, v8] Vectorized _cpp_clean_line


Changes since last:

Added Altivec and MMX2 alternatives.

Use a constructor instead of an explicit call during
libcpp initialization.

Andi, I switched back to an indirect function call.
With 4 alternatives the code generation inside of
_cpp_clean_line looked pretty awful.

Tested on {i686,x86_64,ppc64,ia64}-linux.  On the
ppc64 box, I used BOOT_CFLAGS with -mcpu=G5 in order
to enable the Altivec path.

Committed.


r~

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