Fix alias problems in PR19633

[Diego Novillo]

I'm testing this patch.  Richard, let me know if this gives you enough 
information for what you wanted to do.  If so, I'll commit this version.

The call to count_uses_and_derefs returns three values:  The number of 
direct uses for a pointer P in the statement, the number of dereferences 
for P and a boolean flag that's true if there is at least 1 indirect 
store through P in the statement.

The function is static now but I will need to expose it for some work 
I'm doing on the cleanup branch.  Will you be using it from outside of 
tree-ssa-alias.c?

Mainline is broken on x86-64 ATM (this is unrelated to my patch), so I 
will not be applying the patch until I can get a clean bootstrap on x86-64.


Diego.
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