This commit introduces the PruneRetSuccessors pass, whose role is to
identify all the indirect jumps whose devirtualized destinations
correspond to return addresses. In fact, they are most likely to be
return instructions and devirtualizing them is always detrimental.
This commit replicates the structure of the install directory into the
build directory in order to simplify the management of RPATHs.
This commit also drop `QEMU_INSTALL_PATH`.
* `GeneratedCodeBasicInfo::getCSVUsedByHelperCall` and
`GeneratedCodeBasicInfo::extractCSVs`: make the call argument an
`Instruction`.
* Introduce `blockByName`
* Introduce `getUniqueUser`.
* Fix linking issues.
This commit does the following:
* It drops `revamb-dump` and transforms all the passes it featured in
passes that can be used directly from `opt`.
* It rename `revamb` to `revng-lift`.
* It introduces a script called `revng` which acts as a driver for the
whole rev.ng project. It replaces `translate`, `revcc`,
`csv-to-ld-options` and `revamb-dump`, since it offers an `opt`
subcommand which allows to easily invoke all the analysis passes.
* It makes the project a CMake package that can be easily used
externally.
* It allows to easily create libraries of analysis to use through
`revng-opt`.
Alessandro Di Federico