* nimRawSetjmp: support Windows
Using `_setjmp()` directly is required to avoid some rare (but very
annoying) exception-related stack corruption leading to segfaults on
Windows, with Mingw-w64 and SEH.
More details: https://github.com/status-im/nimbus-eth2/issues/3121
Also add "nimBuiltinSetjmp" - mostly for benchmarking.
* fix for Apple's Clang++
* Error -> Defect for defects
The distinction between Error and Defect is subjective,
context-dependent and somewhat arbitrary, so when looking at an
exception, it's hard to guess what it is - this happens often when
looking at a `raises` list _without_ opening the corresponding
definition and digging through layers of inheritance.
With the help of a little consistency in naming, it's at least possible
to start disentangling the two error types and the standard lib can set
a good example here.
* Rework exception handling in the VM
Make the safepoint handling more precise and less forgiving.
The new code is clearer and more commented.
Perform cleanup on `return`.
The no-exception-thrown case in a try block should be slightly faster
since we don't parse the whole set of exceptions every time.
More tests.
* Fix silly error that broke a few tests
* Testament doesn't like files having the same name
* Remove test case that failed compilation to js
