Ruby

Revert "Refactor to reduce "swap" instruction of pattern matching"

This reverts commit 3a4be429b50062122d1616256de38649464d3146.

To fix following warning:

compiling ../compile.c ../compile.c:6336:20: warning: variable 'line' is uninitialized when used here [-Wuninitialized] ADD_INSN(head, line, putnil); /* allocate stack for cached #deconstruct value */ ^~~~ ../compile.c:220:57: note: expanded from macro 'ADD_INSN' ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (line), BIN(insn), 0)) ^~~~ ../compile.c:6327:13: note: initialize the variable 'line' to silence this warning int line; ^ = 0 1 warning generated.