Move dwarf2_per_cu_data::imported_symtabs earlier

This moves dwarf2_per_cu_data::imported_symtabs earlier, near where
the other data members are located.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.h (struct dwarf2_per_cu_data) <imported_symtabs>:
	Move earlier.

Change-Id: I314ddaa6f67c53a848e513b3f6d42913bd957833


2 files changed