[lldb][RISCV] Support optionally disabled FPR for riscv64 (#104547)

The PR adds the support optionally enabled/disabled FP-registers to LLDB
`RegisterInfoPOSIX_riscv64`. This situation might take place for RISC-V
builds having no FP-registers, like RV64IMAC or RV64IMACV.

To aim this, patch adds `opt_regsets` flags mechanism. It re-works
RegisterInfo class to work with flexibly allocated (depending on
`opt_regsets` flag) `m_register_sets` and `m_register_infos` vectors
instead of statically defined structures. The registration of regsets is
being arranged by `m_per_regset_regnum_range` map.

The patch flows are spread to `NativeRegisterContextLinux_riscv64` and
`RegisterContextCorePOSIX_riscv64` classes, that were tested on:
 - x86_64 host working with coredumps
- RV64GC and RV64IMAC targets working with coredumps and natively in
run-time with binaries

`EmulateInstructionRISCV` is out of scope of this patch, and its
behavior did not change, using maximum set of registers.

According testcase built for RV64IMAC (no-FPR) was added to
`TestLinuxCore.py`.

0 files changed, 0 insertions, 0 deletions