tree 57f5be6cdf101a5f2cf7846a7027321740251a52
parent 9f2b30a96b31203db64ea41d362752e18f9087bf
author Nicolas Vasilache <ntv@google.com> 1537637744 -0700
committer jpienaar <jpienaar@google.com> 1553890685 -0700

[MLIR] Fix AsmPrinter.cpp for single ssa-id AffineMap

The AsmPrinter wrongly assumes that all single ssa-id AffineMap
are the identity map for the purpose of printing.
This CL adds the missing level of indirection as well as a test.

This bug was originally shaken off by the experimental TC->MLIR path.

Before this CL, the test would print:
```
mlfunc @mlfuncsimplemap(%arg0 : affineint, %arg1 : affineint, %arg2 : affineint) {
  for %i0 = 0 to %arg0 {
    for %i1 = 0 to %i0 {
                   ~~~   should be %arg1
      %c42_i32 = constant 42 : i32
    }
  }
  return
}
```

PiperOrigin-RevId: 214120817