loongarch: fix FTBFS when building pcre2test as part of PCRE2 (zhercz…

…eg#220)

When `sljit_u32 cpu_feature_list` was introduced, it wasn't set as
static and therefore would fail linking if multiple copies of it
were used as is done by pcre2test.

Make it static (as used everywhere) and while at it, rename the
`dst` parameter in `sljit_emit_fop2r` as well as other styling
changes for consistency.

sljit_src/sljitNativeLOONGARCH_64.c

@@ -26,9 +26,7 @@
 
 SLJIT_API_FUNC_ATTRIBUTE const char* sljit_get_platform_name(void)
 {
-#if (defined SLJIT_CONFIG_LOONGARCH_64 && SLJIT_CONFIG_LOONGARCH_64)
 	return "LOONGARCH" SLJIT_CPUINFO;
-#endif /* SLJIT_CONFIG_LOONGARCH_64 */
 }
 
 typedef sljit_u32 sljit_ins;
@@ -61,7 +59,7 @@ static const sljit_u8 freg_map[SLJIT_NUMBER_OF_FLOAT_REGISTERS + 3] = {
 /*
 LoongArch instructions are 32 bits wide, belonging to 9 basic instruction formats (and variants of them):
 
-| Format name  | Composition 				 |
+| Format name  | Composition                 |
 | 2R           | Opcode + Rj + Rd            |
 | 3R           | Opcode + Rk + Rj + Rd       |
 | 4R           | Opcode + Ra + Rk + Rj + Rd  |
@@ -338,10 +336,10 @@ lower parts in the instruction word, denoted by the “L” and “H” suffixes
 #define INST(inst, type) ((sljit_ins)((type & SLJIT_32) ? inst##_W : inst##_D))
 
 /* LoongArch CPUCFG register for feature detection */
-#define LOONGARCH_CFG2				0x02
+#define LOONGARCH_CFG2			0x02
 #define LOONGARCH_FEATURE_LAMCAS	(1 << 28)
 
-sljit_u32 cpu_feature_list = 0;
+static sljit_u32 cpu_feature_list = 0;
 
 static SLJIT_INLINE sljit_u32 get_cpu_features(void)
 {
@@ -2393,14 +2391,14 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fop2(struct sljit_compiler *compil
 }
 
 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fop2r(struct sljit_compiler *compiler, sljit_s32 op,
-	sljit_s32 dst,
+	sljit_s32 dst_freg,
 	sljit_s32 src1, sljit_sw src1w,
 	sljit_s32 src2, sljit_sw src2w)
 {
 	sljit_s32 reg;
 
 	CHECK_ERROR();
-	CHECK(check_sljit_emit_fop2r(compiler, op, dst, src1, src1w, src2, src2w));
+	CHECK(check_sljit_emit_fop2r(compiler, op, dst_freg, src1, src1w, src2, src2w));
 	ADJUST_LOCAL_OFFSET(src1, src1w);
 	ADJUST_LOCAL_OFFSET(src2, src2w);
 
@@ -2410,12 +2408,12 @@ SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fop2r(struct sljit_compiler *compi
 	}
 
 	if (src1 & SLJIT_MEM) {
-		reg = (dst == src2) ? TMP_FREG1 : dst;
+		reg = (dst_freg == src2) ? TMP_FREG1 : dst_freg;
 		FAIL_IF(emit_op_mem2(compiler, FLOAT_DATA(op) | LOAD_DATA, reg, src1, src1w, 0, 0));
 		src1 = reg;
 	}
 
-	return push_inst(compiler, FINST(FCOPYSIGN, op) | FRD(dst) | FRJ(src1) | FRK(src2));
+	return push_inst(compiler, FINST(FCOPYSIGN, op) | FRD(dst_freg) | FRJ(src1) | FRK(src2));
 }
 
 SLJIT_API_FUNC_ATTRIBUTE sljit_s32 sljit_emit_fset32(struct sljit_compiler *compiler,