[patch, libfortran] Mark some codepaths as likely/unlikely

[Thomas Koenig]

Hello world,

here's a straightforward patch to mark some codepaths as
likely/unlikely, depending on two criteria:

- A codepath that reaches generate_error() is assumed to be unlikely

- A test for GFC_CONVERT_NATIVE is assumed to be likely

Regression-tested on i686-pc-linux-gnu.  OK?

	Thomas

2008-10-15  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* io/file_pos.c (unformatted_backspace): Normal case is
	GFC_CONVERT_NATIVE.
	* io/transfer.c (read_sf):  Mark paths leading to generate_error()
	as unlikely.
	(readl_block_form):  Likewise.
	(read_block_direct):  Likewise.
	(write_block):  Likewise.
	(write_buf):  Likewise.
	(us_read):  Likewise.  Normal case is GFC_CONVERT_NATIVE.
	(next_record_w_unf):  Mark paths leading to generate_error()
	as unlikely.

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