[m-rev.] diff: fix tests/valid/inst_perf_bug_[12]

[Zoltan Somogyi]

These two tests started failing recently in decldebug and debug.trseg grades
on testing.mercurylang.org. I am pretty sure is that my recent changes to
inst_mode_type_prop.m took these tests from taking just under 300 seconds
on that machine to just over, which causes them to killed due to
the 300 second limit imposed by tools/test_mercury. I tried to use
pragma type_specs to eliminate much of the overhead, but that
does not work in when the compiler is compiled in a debug grade.

This diff deletes one level of the pyramid of insts these tests have to
process. On my just-less-than-three-year-old laptop, these changes
take the time taken by a compiler that is itself compiled in grade
asm_fast.gc.decldebug.stseg to compile inst_perf_bug_1 from 100 seconds
to 25, and inst_perf_bug_2 from 159 seconds to 40.

BTW, my laptop's CPU is an Intel Core i7-8750H (6x 2.20-4.10 GHz Six-Core).
What CPU does testing.mercurylang.org use?

Zoltan.
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