gdb: Convert language la_emitchar field to a method

This commit changes the language_data::la_emitchar function pointer
member variable into a member function of language_defn.

There should be no user visible changes after this commit.

gdb/ChangeLog:

	* ada-lang.c (emit_char): Renamed to ada_language::emitchar.
	(ada_language_data): Delete la_emitchar initializer.
	(ada_language::emitchar): New member function, implementation from
	emit_char.
	* c-lang.c (c_language_data): Delete la_emitchar initializer.
	(cplus_language_data): Likewise.
	(asm_language_data): Likewise.
	(minimal_language_data): Likewise.
	* d-lang.c (d_language_data): Likewise.
	* f-lang.c (f_emit_char): Rename to f_language::emitchar.
	(f_language_data): Delete la_emitchar initializer.
	(f_language::emitchar): New member function, implementation from
	f_emit_char.
	* go-lang.c (go_language_data): Delete la_emitchar initializer.
	* language.c (unk_lang_emit_char): Delete.
	(language_defn::emitchar): New member function definition.
	(unknown_language_data): Delete la_emitchar initializer.
	(unknown_language::emitchar): New member function.
	(auto_language_data): Delete la_emitchar initializer.
	(auto_language::emitchar): New member function.
	* language.h (language_data): Delete la_emitchar field.
	(language_defn::emitchar): New member field declaration.
	(LA_EMIT_CHAR): Update call to emitchar.
	* m2-lang.c (m2_emit_char): Rename to m2_language::emitchar.
	(m2_language_data): Delete la_emitchar initializer.
	(m2_language::emitchar): New member function, implementation from
	m2_emit_char.
	* objc-lang.c (objc_language_data): Delete la_emitchar
	initializer.
	* opencl-lang.c (opencl_language_data): Likewise.
	* p-lang.c (pascal_emit_char): Rename to pascal_language::emitchar.
	(pascal_language_data): Delete la_emitchar initializer.
	(pascal_language::emitchar): New member function, implementation
	from pascal_emit_char.
	* rust-lang.c (rust_emitchar): Rename to rust_language::emitchar.
	(rust_language_data): Delete la_emitchar initializer.
	(rust_language::emitchar): New member function, implementation
	from rust_emitchar.

gdb/m2-lang.c

@@ -30,59 +30,6 @@
 #include "gdbarch.h"
 
 static void m2_printchar (int, struct type *, struct ui_file *);
-static void m2_emit_char (int, struct type *, struct ui_file *, int);
-
-/* Print the character C on STREAM as part of the contents of a literal
-   string whose delimiter is QUOTER.  Note that that format for printing
-   characters and strings is language specific.
-   FIXME:  This is a copy of the same function from c-exp.y.  It should
-   be replaced with a true Modula version.  */
-
-static void
-m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
-{
-
-  c &= 0xFF;			/* Avoid sign bit follies.  */
-
-  if (PRINT_LITERAL_FORM (c))
-    {
-      if (c == '\\' || c == quoter)
-	{
-	  fputs_filtered ("\\", stream);
-	}
-      fprintf_filtered (stream, "%c", c);
-    }
-  else
-    {
-      switch (c)
-	{
-	case '\n':
-	  fputs_filtered ("\\n", stream);
-	  break;
-	case '\b':
-	  fputs_filtered ("\\b", stream);
-	  break;
-	case '\t':
-	  fputs_filtered ("\\t", stream);
-	  break;
-	case '\f':
-	  fputs_filtered ("\\f", stream);
-	  break;
-	case '\r':
-	  fputs_filtered ("\\r", stream);
-	  break;
-	case '\033':
-	  fputs_filtered ("\\e", stream);
-	  break;
-	case '\007':
-	  fputs_filtered ("\\a", stream);
-	  break;
-	default:
-	  fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
-	  break;
-	}
-    }
-}
 
 /* FIXME:  This is a copy of the same function from c-exp.y.  It should
    be replaced with a true Modula version.  */
@@ -364,7 +311,6 @@ extern const struct language_data m2_language_data =
   &exp_descriptor_modula2,
   m2_printchar,			/* Print character constant */
   m2_printstr,			/* function to print string constant */
-  m2_emit_char,			/* Function to print a single character */
   m2_print_typedef,		/* Print a typedef using appropriate syntax */
   NULL,		                /* name_of_this */
   false,			/* la_store_sym_names_in_linkage_form_p */
@@ -435,6 +381,51 @@ public:
   {
     return m2_parse (ps);
   }
+
+  /* See language.h.  */
+
+  void emitchar (int ch, struct type *chtype,
+		 struct ui_file *stream, int quoter) const override
+  {
+    ch &= 0xFF;			/* Avoid sign bit follies.  */
+
+    if (PRINT_LITERAL_FORM (ch))
+      {
+	if (ch == '\\' || ch == quoter)
+	  fputs_filtered ("\\", stream);
+	fprintf_filtered (stream, "%c", ch);
+      }
+    else
+      {
+	switch (ch)
+	  {
+	  case '\n':
+	    fputs_filtered ("\\n", stream);
+	    break;
+	  case '\b':
+	    fputs_filtered ("\\b", stream);
+	    break;
+	  case '\t':
+	    fputs_filtered ("\\t", stream);
+	    break;
+	  case '\f':
+	    fputs_filtered ("\\f", stream);
+	    break;
+	  case '\r':
+	    fputs_filtered ("\\r", stream);
+	    break;
+	  case '\033':
+	    fputs_filtered ("\\e", stream);
+	    break;
+	  case '\007':
+	    fputs_filtered ("\\a", stream);
+	    break;
+	  default:
+	    fprintf_filtered (stream, "\\%.3o", (unsigned int) ch);
+	    break;
+	  }
+      }
+  }
 };
 
 /* Single instance of the M2 language.  */