dw2gencfi.c DWARF2_FDE_RELOC_SIZE

dw2gencfi.c DWARF2_FDE_RELOC_SIZE

Add asserts that reloc size matches encoding size, and tidy.

	* dw2gencfi.c (encoding_size): Return unsigned int.
	(emit_expr_encoded): Assert size matches reloc bitsize.
	(output_fde): Use unsigned for offset_size and addr_size.  Set
	addr_size earlier and use in place of constant 4 and uses of
	DWARF2_FDE_RELOC_SIZE.  Assert it matches reloc bitsize.