DAGCombiner: Merge store/loads when we have extload/truncstores

[Nadav Rotem]

LGTM. 

On Apr 2, 2013, at 8:28 AM, Arnold Schwaighofer <aschwaighofer at apple.com> wrote:

> DAGCombiner: Merge store/loads when we have extload/truncstores
> 
> This is helps on architectures where i8,i16 are not legal but we have byte,
> and short loads/stores like on ARM.
> 
> Allowing us to merge copies like the one below on ARM.
> 
> copy(char *a, char *b, int n) {
>  do {
>    int t0 = a[0];
>    int t1 = a[1];
>    b[0] = t0;
>    b[1] = t1;
> 
> radar://13536387
> 
> <0001-DAGCombiner-Merge-store-loads-when-we-have-extload-t.patch>

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