[tuples] Fix latent bug in walk_gimple_asm

Diego Novillo dnovillo@google.com
Wed Dec 5 21:13:00 GMT 2007

It is possible to call walk_gimple_asm with WI == NULL (when the client 
code does not care for keeping state information).  This was triggering 
with other code I'm enabling separately.

Tested on x86_64.

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