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1de23e432d
This enhances the auto-init remark with information about the variable
that is auto-initialized.
This is based of debug info if available, or alloca names (mostly for
development purposes).
```
auto-init.c:4:7: remark: Call to memset inserted by -ftrivial-auto-var-init. Memory operation size: 4096 bytes.Variables: var (4096 bytes). [-Rpass-missed=annotation-remarks]
int var[1024];
^
```
This allows to see things like partial initialization of a variable that
the optimizer won't be able to completely remove.
Differential Revision: https://reviews.llvm.org/D97734