Improve IR dumping information

This patch adds naming to various member when dumping IR, e.g. function
names to basic block clusters, basic block pseudo names to each basic
blocks. Also, fixed phase 2 IR dumping not printing out the name of
functions.

Author: ChAoSUnItY

src/arm-codegen.c

@@ -147,11 +147,10 @@ void cfg_flatten(void)
     elf_offset += 24;
 
     for (func = FUNC_LIST.head; func; func = func->next) {
-        ph2_ir_t *flatten_ir;
-
         /* reserve stack */
-        flatten_ir = add_ph2_ir(OP_define);
+        ph2_ir_t *flatten_ir = add_ph2_ir(OP_define);
         flatten_ir->src0 = func->stack_size;
+        strncpy(flatten_ir->func_name, func->return_def.var_name, MAX_VAR_LEN);
 
         for (basic_block_t *bb = func->bbs; bb; bb = bb->rpo_next) {
             bb->elf_offset = elf_offset;

src/riscv-codegen.c

@@ -124,6 +124,7 @@ void cfg_flatten(void)
         /* reserve stack */
         ph2_ir_t *flatten_ir = add_ph2_ir(OP_define);
         flatten_ir->src0 = func->stack_size;
+        strncpy(flatten_ir->func_name, func->return_def.var_name, MAX_VAR_LEN);
 
         for (basic_block_t *bb = func->bbs; bb; bb = bb->rpo_next) {
             bb->elf_offset = elf_offset;

src/ssa.c

@@ -991,7 +991,7 @@ void bb_dump(FILE *fd, func_t *func, basic_block_t *bb)
         printf("Warning: normal BB with condition\n");
 
     fprintf(fd, "subgraph cluster_%p {\n", bb);
-    fprintf(fd, "label=\"BasicBlock %p\"\n", bb);
+    fprintf(fd, "label=\"BasicBlock %p (%s)\"\n", bb, bb->bb_label_name);
 
     insn_t *insn = bb->insn_list.head;
     if (!insn)
@@ -1170,7 +1170,7 @@ void dump_cfg(char name[])
     for (func_t *func = FUNC_LIST.head; func; func = func->next) {
         func->visited++;
         fprintf(fd, "subgraph cluster_%p {\n", func);
-        fprintf(fd, "label=\"%p\"\n", func);
+        fprintf(fd, "label=\"%p (%s)\"\n", func, func->return_def.var_name);
         bb_dump(fd, func, func->bbs);
         fprintf(fd, "}\n");
     }