[binutils-gdb] write_pieced_value: Fix buffer offset for memory pieces

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 07c9ca3bd8e6f83bcec49c922b52422c538f60f7 ***

Author: Andreas Arnez <arnez@linux.vnet.ibm.com>
Branch: master
Commit: 07c9ca3bd8e6f83bcec49c922b52422c538f60f7

write_pieced_value: Fix buffer offset for memory pieces

In write_pieced_value, when transferring the data to target memory via a
buffer, the bit offset within the target value is not reduced to its
sub-byte fraction before using it as a bit offset into the buffer.  This
is fixed.

gdb/ChangeLog:

	* dwarf2loc.c (write_pieced_value): In DWARF_VALUE_MEMORY,
	truncate full bytes from dest_offset_bits before using it as an
	offset into the buffer.