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

[Peter Wang]

On Sat, 15 Jan 2022 00:26:13 +1100 "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> 
> 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?

/proc/cpuinfo says: Intel(R) Xeon(R) CPU E5-2680 v2 @ 2.80GHz
but it's a VPS so we only get a slice of that (2 virtual cores).
It has 2 GB RAM.

Peter