Clean up Literal comparision mismatch messages.

Make the error messages more consistent between "Near" comparisons and "Equal" comparisons, and give Shape index for mismatches in tuples. Also, polish flag descriptions and test output in run_hlo_module.

==== BEFORE:

Mismatches in shape (s32[], s32[], s32[]) (3 elements):
Expected equality of these values:
  470211269
  0
at index {}:
expected: 470211269
actual:   0

==== AFTER:

Mismatches in shape (s32[], s32[], s32[]) (3 elements):

Array at shape index {1}, first mismatch at array index {}:
  expected value: 470211269
  actual value:   0

Expected literal:
(s32[], s32[], s32[]) (
-1865008400,
470211269,
470211269
)

Actual literal:
(s32[], s32[], s32[]) (
-1865008400,
0,
470211269
)

PiperOrigin-RevId: 210017733

0 files changed, 0 insertions, 0 deletions