bpf_loader: introduce disable_deprecated_load_instructions feature #22357
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disable_deprecated_load_instructions disables support for LD_ABS_* and LD_IND_* in rbpf.
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Problem
As part of the move to SBFv2 we want to disable "input buffer" load instructions that don't really make sense in our execution environment.
Summary of Changes
Add the disable_deprecated_load_instructions feature gate that turns on the corresponding rbpf feature solana-labs/rbpf#251