`--report-gpu` does not work with promotions or loop expressions

[jabraham17]

I am finding that --report-gpu does not work with promotions or loop expressions. For example, take the following code

on here.gpus[0] {

  var x, y: [1..10] int;

  @assertOnGpu()
  var z1 = x != y;

  @assertOnGpu()
  var z2 = foreach i in x.domain do x(i) != y(i);

  var z3: [x.domain] bool;
  @assertOnGpu()
  foreach i in x.domain do z3(i) = x(i) != y(i);

  @assertOnGpu()
  var z4 = + reduce (x != y);

  writeln(z1);
  writeln(z2);
  writeln(z3);
  writeln(z4);
}

This compiles and runs fine, and running with startVerboseGpu() shows that kernel launches occur for all 4 z. But if I compile with --report-gpu, it only says there are 2 GPU eligible loops, for z3 and z4.

$ chpl foo2.chpl --report-gpu
GPU INELIGIBLE LOOPS:
---------------------

GPU ELIGIBLE LOOPS:
-------------------
foo2.chpl:13
foo2.chpl:16