[jit] Support simple trans/exec measurement - #31
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* Optimizations have been made to instructions affecting PCs * Removed the per-block entry PC load and the per-instruction PC increment/store. * Applied to ir, mir, llvm, tpde, lightning, xbyak, asmjit. * xbyak additionally batches the icount update.
Chain translated blocks directly instead of returning to the C++ dispatcher after each block. A shared direct-mapped TB-cache probe is emitted inline at block exit; on hit the successor is entered without a dispatcher round-trip. - ir, llvm: true tail-call (ir_TAILCALL / musttail) - mir, lightning, xbyak, asmjit: stores the successor pointer into next_tb and the dispatcher's do/while loop calls it (safe tail-call w/o overflow). - tpde: no block chaining now. Shared LLVM builder is parametrized by so llvm gets MustTail while tpde gets None.
On tailcall-chained backends (llvm, ir) the outgoing PC is now passed directly into the TB-cache probe instead of being reloaded from memory, and cpu.pc is stored only on paths that return to the dispatcher (miss / finished / JALR), not on the chained-hit path.
Replace C-style casts with static_cast
* Collect statistics into JSON file option was added * Interpret stage measurements was added
* Introduced new metrics host cycles (compilation) / translated icount * Introduced new metrics host cycles (execution) / total icount
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