[vm] Untabify the VM C code.

This is a follow up of #11010 ; I've realized that for example in #11123
a large part of the patch is detabification as indeed the files are
mixed in tabs/space style so developers are forced to do the cleanup
each time they work on them.

Command used:

```
for i in `find . -name '*.c' -or -name '*.h'; do expand -i "$i" | sponge "$i"; sed -e's/[[:space:]]*$//' -i.bak "$i"; done
```

Checked empty diff with `git diff --ignore-all-space`

0 files changed, 0 insertions, 0 deletions