riscv: update c-variadic test for LLVM changes
LLVM 23 is now handling register allocation slightly differently and
only uses CostPerUse=1 in -O{s,z} instead of unconditionally. This
causes the -O3 behavior in this test to be a little smarter and skip
some moves.
I have attempted to make the test pass on both LLVM 22 and 23 without
overly weakening it. Hopefully this is good enough!
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