Change headers and files to be named "lightening" instead of "jit"

This improves integration with other projects.  Like for example Guile
already has files named jit.c and jit.h; it's easier to manage if
lightening uses its own file names.

jit/mips.h

@@ -1,115 +0,0 @@
-/*
- * Copyright (C) 2012-2017  Free Software Foundation, Inc.
- *
- * This file is part of GNU lightning.
- *
- * GNU lightning is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 3, or (at your option)
- * any later version.
- *
- * GNU lightning is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
- * License for more details.
- *
- * Authors:
- *	Paulo Cesar Pereira de Andrade
- */
-
-#ifndef _jit_mips_h
-#define _jit_mips_h
-
-#define JIT_HASH_CONSTS		1
-#define JIT_NUM_OPERANDS	3
-
-#if _MIPS_SIM != _ABIO32
-#    define NEW_ABI		1
-#endif
-
-/*
- * Types
- */
-#define JIT_FP			_FP
-typedef enum {
-#define jit_r(i)		(_V0 + (i))
-#if NEW_ABI
-#  define jit_r_num()		7
-#else
-#  define jit_r_num()		11
-#endif
-#define jit_v(i)		(_S0 + (i))
-#define jit_v_num()		8
-#define jit_f(i)		(_F0 + (i))
-#if NEW_ABI
-#  define jit_f_num()		6
-#else
-#  define jit_f_num()		8
-#endif
-    _AT,
-#define JIT_R0			_V0
-#define JIT_R1			_V1
-#if NEW_ABI
-#  define JIT_R2		_T4
-#  define JIT_R3		_T5
-#  define JIT_R4		_T6
-#  define JIT_R5		_T7
-#  define JIT_R6		_T8
-#else
-#  define JIT_R2		_T0
-#  define JIT_R3		_T1
-#  define JIT_R4		_T2
-#  define JIT_R5		_T3
-#  define JIT_R6		_T4
-#  define JIT_R7		_T5
-#  define JIT_R8		_T6
-#  define JIT_R9		_T7
-#  define JIT_R10		_T8
-#endif
-    _V0, _V1,
-#if !NEW_ABI
-    _T0, _T1, _T2, _T3,
-#endif
-    _T4, _T5, _T6, _T7, _T8, _T9,
-#define JIT_V0			_S0
-#define JIT_V1			_S1
-#define JIT_V2			_S2
-#define JIT_V3			_S3
-#define JIT_V4			_S4
-#define JIT_V5			_S5
-#define JIT_V6			_S6
-#define JIT_V7			_S7
-    _S0, _S1, _S2, _S3, _S4, _S5, _S6, _S7,
-    _ZERO, _K0, _K1, _RA,
-    _GP,
-    _SP, _FP,
-#if NEW_ABI
-    _A7, _A6, _A5, _A4,
-#endif
-    _A3, _A2, _A1, _A0,
-#define JIT_F0			_F0
-#define JIT_F1			_F2
-#define JIT_F2			_F4
-#define JIT_F3			_F6
-#define JIT_F4			_F8
-#define JIT_F5			_F10
-#if !NEW_ABI
-#  define JIT_F6		_F16
-#  define JIT_F7		_F18
-#endif
-    _F0, _F2, _F4, _F6, _F8, _F10,
-    /* callee save float registers */
-#if !NEW_ABI
-    _F16, _F18,
-#endif
-    _F20, _F22, _F24, _F26, _F28, _F30,
-#if NEW_ABI
-    _F19, _F18, _F17, _F16, _F15, _F14, _F13, _F12,
-#else
-    _F14, _F12,
-#endif
-#define JIT_NOREG		_NOREG
-    _NOREG,
-} jit_reg_t;
-
-#endif /* _jit_mips_h */