This patch implements `MCInstrAnalysis` state in order to be able
analyze auipc+jalr pairs inside `evaluateBranch`.
This is implemented as follows:
- State: array of currently known GPR values;
- Whenever an auipc is detected in `updateState`, update the state value
of RD with the immediate;
- Whenever a jalr is detected in `evaluateBranch`, check if the state
holds a value for RS1 and use that to compute its target.
Note that this is similar to how binutils implements it and the output
of llvm-objdump should now mostly match the one of GNU objdump.
This patch also updates the relevant llvm-objdump patches and adds a new
one testing the output for interleaved auipc+jalr pairs.
95f924f30a