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Edwin Török
5a37699956
clang-21 refuses to compile this:
```
test_x86_emulator.c:1164:24: error: shifting a negative signed value is undefined [-Werror,-Wshift-negative-value]
1164 | regs.r8 = (-1L << 40) + 1;
| ~~~ ^
1 error generated.
```
The shift could also exceed the width of the type on some systems.
I confirmed that both the old and the new code would produce the same value
with GCC on x86-64: `0xffffff0000000001`.
Signed-off-by: Edwin Török <edwin.torok@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>