Validate that memory access is done via variables

The address sanitizer is now able to detect whenever in an instruction a
memory access is done without using variables. This is now detected for
all instructions except for branching, which falls outside of this
scope.

Moreover, simple arithmetics is allowed and bounds are checked for
simple cases. That being said, more involved bound checks should be done
with other tools (e.g. emulators).

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

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