LTO plugin: modernize a bit.

diff --git a/include/plugin-api.h b/include/plugin-api.h
index 4e12c0320d6..8aebe2ff267 100644
--- a/include/plugin-api.h
+++ b/include/plugin-api.h
@@ -487,40 +487,40 @@  enum ld_plugin_level
  
  enum ld_plugin_tag
  {
-  LDPT_NULL = 0,
-  LDPT_API_VERSION = 1,
-  LDPT_GOLD_VERSION = 2,
-  LDPT_LINKER_OUTPUT = 3,
-  LDPT_OPTION = 4,
-  LDPT_REGISTER_CLAIM_FILE_HOOK = 5,
-  LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK = 6,
-  LDPT_REGISTER_CLEANUP_HOOK = 7,
-  LDPT_ADD_SYMBOLS = 8,
-  LDPT_GET_SYMBOLS = 9,
-  LDPT_ADD_INPUT_FILE = 10,
-  LDPT_MESSAGE = 11,
-  LDPT_GET_INPUT_FILE = 12,
-  LDPT_RELEASE_INPUT_FILE = 13,
-  LDPT_ADD_INPUT_LIBRARY = 14,
-  LDPT_OUTPUT_NAME = 15,
-  LDPT_SET_EXTRA_LIBRARY_PATH = 16,
-  LDPT_GNU_LD_VERSION = 17,
-  LDPT_GET_VIEW = 18,
-  LDPT_GET_INPUT_SECTION_COUNT = 19,
-  LDPT_GET_INPUT_SECTION_TYPE = 20,
-  LDPT_GET_INPUT_SECTION_NAME = 21,
-  LDPT_GET_INPUT_SECTION_CONTENTS = 22,
-  LDPT_UPDATE_SECTION_ORDER = 23,
-  LDPT_ALLOW_SECTION_ORDERING = 24,
-  LDPT_GET_SYMBOLS_V2 = 25,
-  LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS = 26,
-  LDPT_UNIQUE_SEGMENT_FOR_SECTIONS = 27,
-  LDPT_GET_SYMBOLS_V3 = 28,
-  LDPT_GET_INPUT_SECTION_ALIGNMENT = 29,
-  LDPT_GET_INPUT_SECTION_SIZE = 30,
-  LDPT_REGISTER_NEW_INPUT_HOOK = 31,
-  LDPT_GET_WRAP_SYMBOLS = 32,
-  LDPT_ADD_SYMBOLS_V2 = 33
+  LDPT_NULL,
+  LDPT_API_VERSION,
+  LDPT_GOLD_VERSION,
+  LDPT_LINKER_OUTPUT,
+  LDPT_OPTION,
+  LDPT_REGISTER_CLAIM_FILE_HOOK,
+  LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK,
+  LDPT_REGISTER_CLEANUP_HOOK,
+  LDPT_ADD_SYMBOLS,
+  LDPT_GET_SYMBOLS,
+  LDPT_ADD_INPUT_FILE,
+  LDPT_MESSAGE,
+  LDPT_GET_INPUT_FILE,
+  LDPT_RELEASE_INPUT_FILE,
+  LDPT_ADD_INPUT_LIBRARY,
+  LDPT_OUTPUT_NAME,
+  LDPT_SET_EXTRA_LIBRARY_PATH,
+  LDPT_GNU_LD_VERSION,
+  LDPT_GET_VIEW,
+  LDPT_GET_INPUT_SECTION_COUNT,
+  LDPT_GET_INPUT_SECTION_TYPE,
+  LDPT_GET_INPUT_SECTION_NAME,
+  LDPT_GET_INPUT_SECTION_CONTENTS,
+  LDPT_UPDATE_SECTION_ORDER,
+  LDPT_ALLOW_SECTION_ORDERING,
+  LDPT_GET_SYMBOLS_V2,
+  LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS,
+  LDPT_UNIQUE_SEGMENT_FOR_SECTIONS,
+  LDPT_GET_SYMBOLS_V3,
+  LDPT_GET_INPUT_SECTION_ALIGNMENT,
+  LDPT_GET_INPUT_SECTION_SIZE,
+  LDPT_REGISTER_NEW_INPUT_HOOK,
+  LDPT_GET_WRAP_SYMBOLS,
+  LDPT_ADD_SYMBOLS_V2,
  };
  
  /* The plugin transfer vector.  */
diff --git a/lto-plugin/lto-plugin.c b/lto-plugin/lto-plugin.c
index c9c048d3631..0147b1b9667 100644
--- a/lto-plugin/lto-plugin.c
+++ b/lto-plugin/lto-plugin.c
@@ -122,7 +122,7 @@  struct plugin_symtab
  struct plugin_objfile
  {
    int found;
-  int offload;
+  bool offload;
    simple_object_read *objfile;
    struct plugin_symtab *out;
    const struct ld_plugin_input_file *file;
@@ -205,7 +205,7 @@  static const char *link_output_name = NULL;
  
  /* This indicates link_output_name already contains the dot of the
     suffix, so we can skip it in extensions.  */
-static int skip_in_suffix = 0;
+static bool skip_in_suffix = false;
  
  /* The version of gold being used, or -1 if not gold.  The number is
     MAJOR * 100 + MINOR.  */
@@ -636,7 +636,8 @@  exec_lto_wrapper (char *argv[])
    /* Write argv to a file to avoid a command line that is too long
       Save the file locally on save-temps.  */
    const char *suffix = ".lto_wrapper_args";
-  suffix += skip_in_suffix;
+  if (skip_in_suffix)
+    suffix++;
    if (save_temps && link_output_name)
      arguments_file_name = concat (link_output_name, suffix, NULL);
    else
@@ -1132,7 +1133,7 @@  process_offload_section (void *data, const char *name, off_t offset, off_t len)
    if (startswith (name, ".gnu.offload_lto_.opts"))
      {
        struct plugin_objfile *obj = (struct plugin_objfile *) data;
-      obj->offload = 1;
+      obj->offload = true;
        return 0;
      }
  
@@ -1175,7 +1176,7 @@  claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
    *claimed = 0;
    obj.file = file;
    obj.found = 0;
-  obj.offload = 0;
+  obj.offload = false;
    obj.out = &lto_file.symtab;
    errmsg = NULL;
    obj.objfile = simple_object_start_read (file->fd, file->offset, LTO_SEGMENT_NAME,
@@ -1213,7 +1214,7 @@  claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
      simple_object_find_sections (obj.objfile, process_offload_section,
  				 &obj, &err);
  
-  if (obj.found == 0 && obj.offload == 0)
+  if (obj.found == 0 && !obj.offload)
      goto err;
  
    if (obj.found > 1)
@@ -1250,10 +1251,10 @@  claim_file_handler (const struct ld_plugin_input_file *file, int *claimed)
    /* If this is an LTO file without offload, and it is the first LTO file, save
       the pointer to the last offload file in the list.  Further offload LTO
       files will be inserted after it, if any.  */
-  if (*claimed && obj.offload == 0 && offload_files_last_lto == NULL)
+  if (*claimed && !obj.offload && offload_files_last_lto == NULL)
      offload_files_last_lto = offload_files_last;
  
-  if (obj.offload == 1)
+  if (obj.offload)
      {
        /* Add file to the list.  The order must be exactly the same as the final
  	 order after recompilation and linking, otherwise host and target tables
@@ -1540,7 +1541,7 @@  onload (struct ld_plugin_tv *tv)
  	  assert (escapes == 0);
  	  assert (ticks == oddticks);
  	  assert (q - link_output_name == len - 1);
-	  skip_in_suffix = 1;
+	  skip_in_suffix = true;
  	}
      }