mem sharing fix [Re: Your flow.c change on 4/8]

[Richard Earnshaw]

> Even though this is derived from GCC itself, it's a nice simple test, so I 
> added it to the testsuite.
> 
> Thanks for taking the time to produce a simple test for this bug.

Provided that a test can be reduced to a sufficiently small example, I 
would be inclined to always add it to the testsuite.  The gcc sources are 
mutable code, it can change as the compiler is further developed.  So 
there is no guarantee that a bit of code that triggers a problem in the 
compiler will remain there.  In general, we only change testsuite code if 
it is identifiably wrong.

R.