pushed: [RFA/DWARF] Add array DW_AT_bit_stride and DW_AT_byte_stride support

[Joel Brobecker]

Attached is the patch I ended up pushing. Many thanks to MarkW for
his insightful comments.

gdb/ChangeLog:

        * gdbtypes.h (create_array_type_with_stride): Add declaration.
        * gdbtypes.c (create_array_type_with_stride): New function,
        renaming create_array_type, but with an added parameter
        called "bit_stride".
        (create_array_type): Re-implement using
        create_array_type_with_stride.
        * dwarf2read.c (read_array_type): Add support for DW_AT_byte_stride
        and DW_AT_bit_stride attributes.

gdb/testsuite/ChangeLog:

        * gdb.dwarf2/arr-stride.c: New file.
        * gdb.dwarf2/arr-stride.exp: New file.

-- 
Joel
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