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There is no need to repeat the comments from the header.

Also do some cleanups like using unsigned long instead of size_t for the
size (we are not talking about objects in the compiler so size_t is not
apropriate).

The Conv might result in a sign extend that produces additional one
bits.

This fixes opt/fehler303.c.

Thanks to Christoph for the code review.

Thanks to Christoph for the code review.

In PIC code we cannot use ".rodata" for initializers that contain
relocations but have to use data.rel.ro(.local)

This accidentally fixes backend/ia32_conv.c.

For stabs debug info it was used to suppress debug info, so set ir_visibility_private instead.

entity_is_externally_visible() checks for IR_LINKAGE_HIDDEN_USER, too.