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Afonso Bordado e64fb6ab39 riscv64: Fix underflow in call relocation handling (#5951 )

Under some test case layouts the call relocation
panicking with an underflow. Use `wrapping_sub` to
signal that this is expected.

The fuzzer took a while to generate such a test case.
And I can't introduce it as a regression test because
when running via the regular clif-util run tests the
layout is different and the test case passes!

I think this is because in the fuzzer we only add
one trampoline, while in clif-util we build trampolines
for each funcion in the file.

Co-authored-by: Jamey Sharp <jsharp@fastly.com>

2023-03-10 11:43:27 +00:00