Optimize: `return (a ? b : c)' as: `if (a) return b; else return c;'.

 
	Optimize: `return (a ? b : c)' as: `if (a) return b; else return c;'.
	* jcf-write.c (generate_bytecode_return):  New function.
	(generate_bytecode_insns):  Use it, for RETURN_EXPR.
	* jcf-write.c (generate_bytecode_insns):  For REAL_CST that is 0 or 1,
	generate special [fd]const_[01] instructions.
	* jcf-parse.c (yyparse):  Don't emit_register_classes if -fsyntax-only.
	* verify.c (verify_jvm_instructions):  Do INVALIDATE_PC after
	handling OPCODE_lookupswitch or OPCODE_tableswitch.

From-SVN: r24972

gcc/java/jcf-parse.c

@@ -841,7 +841,7 @@ yyparse ()
     }
 
   java_expand_classes ();
-  if (!java_report_errors () && !flag_emit_class_files)
+  if (!java_report_errors () && !flag_syntax_only)
     emit_register_classes ();
   return 0;
 }

gcc/java/verify.c

@@ -979,6 +979,7 @@ verify_jvm_instructions (jcf, byte_ops, length)
 
 	    while (low++ <= high)
 	      PUSH_PENDING (lookup_label (oldpc + IMMEDIATE_s4));
+	    INVALIDATE_PC;
 	    break;
 	  }
 
@@ -1010,6 +1011,7 @@ verify_jvm_instructions (jcf, byte_ops, length)
 		last = match;
 		PUSH_PENDING (lookup_label (oldpc + IMMEDIATE_s4));
 	      }
+	    INVALIDATE_PC;
 	    break;
 	  }