[OpenACC][CIR] Generate private recipe pointer/array 'alloca's (#160911) As a next step to generating pointer/array recipes, this patch generates just the 'alloca' lines that are necessary. Copying pointers over to restore the structure is held off to the next patch. In the case of a pointer, we need to allocate the level 'below' it (if we index into it), then copy the values into the pointers. In the case of an array, we skip the alloca (since the array's alloca contains the value). After this, we'll need a patch that copies the pointers into place, and finally one that does the initialization of these values.
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