Translate [rip +- offset] to absolute RVA's in R2RDump (dotnet/coreclr#19219)

Translate [rip +- offset] to absolute RVA's in R2RDump (dotnet/coreclr#19219)

* Translate [rip +- offset] to absoluate RVA's in R2RDump

The existing logic for displaying rip-relative addressed on X64
make it very hard to calculate the final addresses. I have added
a horrendous hack using textual analysis of the disassembled
instruction to translate this notation to absolute RVA's.

As part of this effort I have also encapsulated the CorDisTools
helper in a new class Disassembler that also contains customizable
provisions for handling special assembly cases on the individual
architectures.

Thanks

Tomas

* Temporarily block out disassembly to make tests pass

In my initial commit I removed the line blocking out disassembly
however this ends up failing several lab tests so I'm putting the
line back.

Thanks

Tomas

Commit migrated from https://github.com/dotnet/coreclr/commit/66b3197f69cf4669ba04a7a8121d33d9aa5d3c9d