gccint: Compound Lvalues

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1 12.6.2 Compound Lvalues
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1 Currently compound lvalues involving array and structure field
1 references are not broken down; an expression like 'a.b[2] = 42' is not
1 reduced any further (though complex array subscripts are).  This
1 restriction is a workaround for limitations in later optimizers; if we
1 were to convert this to
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1      T1 = &a.b;
1      T1[2] = 42;
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1  alias analysis would not remember that the reference to 'T1[2]' came by
1 way of 'a.b', so it would think that the assignment could alias another
1 member of 'a'; this broke 'struct-alias-1.c'.  Future optimizer
1 improvements may make this limitation unnecessary.
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