(parser_build_binary_op): Warn about overflows and
conversions of out-of-range constants in parser-built binary expressions.
(build_conditional_expr): Check conversions in if-then-else expressions.
(build_c_cast): Ignore any integer overflow caused by a cast.
(convert_for_assignment): Warn if source had overflow in folding.
(process_init_constructor): Report overflows in array initializer indexes.

From-SVN: r3404