[m-rev.] [Mercury-Language/mercury] Hashing-related fixes (#67)

[Zoltan Somogyi]

On Sun, 28 Jul 2019 18:35:56 -0700, wangp <notifications at github.com> wrote:

> Merged #67 into master.

I found today that a bootcheck failed three test cases, two of which may be
related to this change:

    hard_coded/hash_table_test
    hard_coded/version_hash_table_test2
    par_conj/pathological_right_recursion

It *is* possible that this is a coincidence, because the bootcheck was with an Mmake.stage.params containing

    EXTRA_MCFLAGS = -O0

which I don't normally specify. (I was using a very old workspace.) These tests
work just fine without the -O0.

Zoltan.