Misc upstream fixes

rui314/chibicc#54
rui314/chibicc#98
rui314/chibicc#118

codegen.c

@@ -632,7 +632,7 @@ static void copy_struct_reg(void) {
   if (ty->size > 8) {
     if (has_flonum(ty, 8, 16, 0)) {
       assert(ty->size == 12 || ty->size == 16);
-      if (ty->size == 4)
+      if (ty->size == 12)
         println("  movss 8(%%rdi), %%xmm%d", fp);
       else
         println("  movsd 8(%%rdi), %%xmm%d", fp);

hashmap.c

@@ -89,12 +89,6 @@ static HashEntry *get_or_insert_entry(HashMap *map, char *key, int keylen) {
     if (match(ent, key, keylen))
       return ent;
 
-    if (ent->key == TOMBSTONE) {
-      ent->key = key;
-      ent->keylen = keylen;
-      return ent;
-    }
-
     if (ent->key == NULL) {
       ent->key = key;
       ent->keylen = keylen;

main.c

@@ -690,7 +690,7 @@ int main(int argc, char **argv) {
     return 0;
   }
 
-  if (input_paths.len > 1 && opt_o && (opt_c || opt_S | opt_E))
+  if (input_paths.len > 1 && opt_o && (opt_c || opt_S || opt_E))
     error("cannot specify '-o' with '-c,' '-S' or '-E' with multiple files");
 
   StringArray ld_args = {0};

parse.c

@@ -1098,11 +1098,6 @@ static void array_initializer1(Token **rest, Token *tok, Initializer *init) {
 
   bool first = true;
 
-  if (init->is_flexible) {
-    int len = count_array_init_elements(tok, init->ty);
-    *init = *new_initializer(array_of(init->ty->base, len), false);
-  }
-
   for (int i = 0; !consume_end(rest, tok); i++) {
     if (!first)
       tok = skip(tok, ",");