dwarf2read: Use bool for dwarf2_section_info fields

Use bool instead of char where applicable in dwarf2_section_info.

No functional changes intended.

gdb/ChangeLog:

	* dwarf2read.h (struct dwarf2_section_info) <readin,
	is_virtual>: Change type to bool.
	* dwarf2read.c (dwarf2_read_section, create_dwp_v2_section): Use
	true instead of 1.
3 files changed