[lto] revised PATCH: Add DIE readers for array and enum types

[Sandra Loosemore]

This is a revised version of the patch I submitted about a week ago.  I've 
addressed the concerns Mark pointed out about the handling of signed vs unsigned 
numbers by distinguishing them in the DWARF2_form_data struct and introducing 
new helper functions to convert the data in that structure to a host int (mainly 
used for parsing various DWARF flags) or target integer constant of a specified 
type.

The new feature rolled into this patch that wasn't in the initial version is 
that I added stuff to cause DWARF information to be emitted for global 
variables, which has helped me to test things a little better this time around.

OK to commit yet?

-Sandra

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