Fix clobbers so that GENERIC may compile with egcs.

Historically, the documentation of extended asm was lacking, namely you
should NOT specify the same register as an input, and a clobber.
If the register is clobbered, it should be specified as an output as well,
e.g., by linking input and output through the "number" notation.

(Beware of lvalues, some local variables needed...)

In older versions, up-to egcs1.1.1, the compiler did not even warn about
it, but it was liable to output bad code. Newer egcs are pickier and
simply refuse to swallow such code.

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