more robust backtraces for syscalls on x86
* new optimization policy: ALIEN-FUNCALL-SAVES-FP-AND-PC Set to 3 for
self-build on x86 to get reliable more backtraces there, and 0 for
other platforms. (1 matches the old SPEED <= DEBUG behaviour.)
* When using a saved FP, and an interrupt context has a bogus
FP, assume it is an interrupted syscall frame.
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