pl: replace LLVM JIT with a tree-walking interpreter#883
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Execute PL by walking the resolved ObPLStmt tree (ObPLInterpreter) instead of JIT-compiling routines with LLVM, and remove the ORC-JIT code generator and the objit module. The interpreter dispatches blocks, DECLARE ... DEFAULT, assignment (including SET @user_var / @@sys_var), IF/ELSEIF, CASE, WHILE, LOOP, REPEAT, LEAVE, ITERATE, embedded SQL, RETURN (with deep-copied results), cursors (DECLARE/OPEN/FETCH/CLOSE), exception handling (DECLARE HANDLER, SIGNAL, completion conditions), and nested CALL with OUT/INOUT copy-back. It passes the full PL mysqltest suite.
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Execute PL by walking the resolved ObPLStmt tree instead of JIT-compiling routines with LLVM, and remove the ORC-JIT code generator and the objit module.
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