[committed, amdgcn] Remove expcnt waits.

[Andrew Stubbs]

On 31/07/2019 13:02, Andrew Stubbs wrote:
> However, in a couple of cases there is an exposed-pipeline issue that 
> needs to be resolved with an actual "nop", which we no longer have. The 
> patch also takes care of adding these, where appropriate. (As it 
> happens, the cmpswap instruction will now get both s_waitcnt and nop, 
> which is unnecessary, but that's because I plan to add proper scheduling 
> for all the s_waitcnt instructions in the near future, and I don't want 
> this detail to get forgotten.)

I need to do the same for global_store_* instructions, so I've committed 
the attached.

Andrew

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