Hi,

Section 5.4 of the DWARF standard allows to specify extra padding bytes for 
array type entries by using the DW_AT_byte_size attribute. This is used for 
example to specify the types for OpenCL 3-component vectors whose size and 
alignment are those of 4-component vectors. Currently the GDB does not 
understand this mechanism and the attached patch attempts to fix this. It 
extends the DWARF reader (dwarf2read.c:read_array_type) to respect the 
DW_AT_byte_size attribute and set the length of the array accordingly. This 
breaks the code that assumes that the number of elements of an array is simply 
the length of the array type divided by the length of the element type. 
Therefore the patch queries the number of array elements using the 
get_array_bounds function that has been enhanced to only return the bounds if 
they are defined (TYPE_ARRAY_[LOWER|UPPER]_BOUND_IS_UNDEFINED). In order to 
prevent the inclusion of the valprint.h header the get_array_bounds function 
has been moved from valprint.[c|h] to gdbtypes.[c|h].
Tested on i686-*-linux-gnu with no regressions.

Regards
Ken Werner