refactor(ast2ir): 重构ABI类型系统并修复union结构问题

- 将scc_ast_def.h中的attr_of从union改为struct以修复结构定义问题
- 添加type_abi依赖到ast2ir模块的cbuild.toml配置文件中
- 重命名scc_ast2ir.h中的abi字段为type_abi，并更新相关初始化函数签名
- 移除废弃的scc_abi_type.h和相关平台ABI头文件
- 添加辅助函数is_variadic_marker和fixed_param_count用于处理可变参数
- 添加数组和聚合类型初始化的辅助函数

libs/mcode/include/x86/scc_x86_encode.h

@@ -45,26 +45,26 @@ typedef struct {
         scc_x86_mem_t mem;
         scc_x86_reloc_op_t reloc;
     };
-    u8 size;
+    u8 size_bits;
 } scc_x86_operand_value_t;
 
 static inline scc_x86_operand_value_t scc_x86_op_preg(scc_x86_reg_t reg,
-                                                      u8 size) {
+                                                      u8 size_bits) {
     scc_x86_operand_value_t o = {
         .kind = SCC_X86_OPR_REG,
         .reg = reg,
-        .size = size,
+        .size_bits = size_bits,
     };
     return o;
 }
 static inline scc_x86_reg_t scc_x86_op_vreg_reg(int vreg) {
     return (int)SCC_X86_REG_COUNT + vreg;
 }
-static inline scc_x86_operand_value_t scc_x86_op_vreg(int vreg, u8 size) {
+static inline scc_x86_operand_value_t scc_x86_op_vreg(int vreg, u8 size_bits) {
     scc_x86_operand_value_t o = {
         .kind = SCC_X86_OPR_REG,
         .reg = scc_x86_op_vreg_reg(vreg),
-        .size = size,
+        .size_bits = size_bits,
     };
     return o;
 }
@@ -72,24 +72,24 @@ static inline scc_x86_operand_value_t scc_x86_op_relbr(i32 rel) {
     scc_x86_operand_value_t o = {
         .kind = SCC_X86_OPR_RELBR,
         .brdisp = rel,
-        .size = 4,
+        .size_bits = 32,
     };
     return o;
 }
-static inline scc_x86_operand_value_t scc_x86_op_imm(i64 imm, u8 size) {
+static inline scc_x86_operand_value_t scc_x86_op_imm(i64 imm, u8 size_bits) {
     scc_x86_operand_value_t o = {
         .kind = SCC_X86_OPR_IMM,
         .simm0 = imm,
-        .size = size,
+        .size_bits = size_bits,
     };
     return o;
 }
 static inline scc_x86_operand_value_t scc_x86_op_mem(scc_x86_mem_t mem,
-                                                     u8 size) {
+                                                     u8 size_bits) {
     scc_x86_operand_value_t o = {
         .kind = SCC_X86_OPR_MEM,
         .mem = mem,
-        .size = size,
+        .size_bits = size_bits,
     };
     return o;
 }
@@ -102,7 +102,7 @@ scc_x86_op_reloc_global_imm(const char *sym, i64 addend) {
     op.reloc.target = SCC_X86_RELOC_TARGET_SYMBOL;
     op.reloc.global_name = sym;
     op.reloc.addend = addend;
-    op.size = 0;
+    op.size_bits = 0;
     return op;
 }
 
@@ -113,7 +113,7 @@ scc_x86_op_reloc_global_relrip(const char *sym, i64 addend) {
     op.reloc.target = SCC_X86_RELOC_TARGET_SYMBOL;
     op.reloc.global_name = sym;
     op.reloc.addend = addend;
-    op.size = 4;
+    op.size_bits = 32;
     return op;
 }
 
@@ -125,7 +125,7 @@ scc_x86_op_reloc_global_relbr(const char *sym, i64 addend) {
     op.reloc.target = SCC_X86_RELOC_TARGET_SYMBOL;
     op.reloc.global_name = sym;
     op.reloc.addend = addend;
-    op.size = 4;
+    op.size_bits = 32;
     return op;
 }
 
@@ -137,7 +137,7 @@ static inline scc_x86_operand_value_t scc_x86_op_reloc_block(int bid,
     op.reloc.target = SCC_X86_RELOC_TARGET_BBLOCK;
     op.reloc.bblock_id = bid;
     op.reloc.addend = addend;
-    op.size = 4;
+    op.size_bits = 32;
     return op;
 }
 
@@ -151,7 +151,7 @@ scc_x86_op_reloc_global_mem(const char *sym, i64 addend) {
     op.reloc.global_name = sym;
     op.reloc.addend = addend;
     // 编码时需生成 RIP 相对寻址的 ModRM/SIB
-    op.size = 0;
+    op.size_bits = 0;
     return op;
 }