PR17326, PATCH

[Stepan Dyatkovskiy]

Hello,

Please consider two possible fixes.

1. pr17326-forbid-aggregates.patch. If we meet functions with aggregates 
as i-th parameter, treat them as equal only in case when it is exactly 
the same aggregate: LeftParamType == RightParamType.

2. pr17326-tricky-bitcast.patch. Hackish. If we meet functions with 
aggregates as i-th parameter, and we 100500% sure aggregates are 
identical, use kind of memcpy in thunk wrapper:
   store %AggrTyLeft %ThatAggregateParameter, %AggrTyLeft* %2
   %3 = bitcast %AggrTyLeft* %2 to %AggrTyRight*
   %4 = load %AggrTyRight* %3
   tail call void @f0(%AggrTyRight %4)

IMHO, it is a seldom case. And its better to forbid it to merging.

-Stepan.
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