```
[5323/5730] Building CXX object tools\llvm-exegesis\lib\CMakeFiles\LLVMExegesis.dir\Error.cpp.obj
In file included from C:\Work\david.spickett\llvm-project\llvm\tools\llvm-exegesis\lib\Error.cpp:9:
C:\Work\david.spickett\llvm-project\llvm\tools\llvm-exegesis\lib/Error.h(76,7): warning: private field 'SignalNumber' is not used [-Wunused-private-field]
76 | int SignalNumber;
| ^
```
`SignalNumber` was only being used on Unixes.
This patch switches to using explicit snippet crashes that contain more
information about the specific type of error (like the address for a
segmentation fault) that occurred. All these new error classes inherit
from SnippetExecutionFailure to allow for easily grabbing all of them in
addition to filtering for specific types using the standard LLVM error
primitives.
Followup to D74085.
Replace the use of `report_fatal_error()` with returning the error to
`llvm-exegesis.cpp` and handling it there.
To facilitate this, a new `Error` type has been added which is only used
to log errors to the yaml output.
Differential Revision: https://reviews.llvm.org/D74215
All errors of type `Failure` are `StringError`s. In order for exit code
mapping to detect that specifically a clustering error has occurred it
needs to have a different type.
This patch also prepares D74085 where termination `report_fatal_error()`
will be replaced with emitting `StringError`s.
Differential Revision: https://reviews.llvm.org/D74124
