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This fixes opt/proc_cloning004.c, opt/proc_cloning005.c, opt/proc_cloning006.c.

This detects missed adjustments of frame Members in proc_cloning early.

Now you only pass a name prefix and it automatically adds a ".%u".

The length is now set on creation.
Neither length nor element type can be changed later on.

The same name was used multiple times, because the counter was not increased anymore.
This was broken more than 6 years ago in 9d564d61.
This fixes opt/proc_cloning003.c.

This fixes opt/proc_cloning001.c.

clone_entity() sets the ld_name now.

This prevents triggering the unique name check in add_compound_member().
This partially fixes opt/proc_cloning001.c.

This fixes backend/convconv2.c.
This typo was introduced in afd4e3d6.

It checked for Const on the wrong side, so it always failed.
Then the code further down used the wrong accessor functions.

Switch lowering always gives an unsigned selector, so 'transform_zext()' is sufficient.

cleanup: Use 'new_global_entity()' instead of 'new_entity()' + 'set_entity_visibility()' + 'set_entity_linkage()'.

In one case the modes do not match: T -> M.
In the other case, a node is created just to set a transformed node for it.
In both cases the source nodes are not looked at anymore.

The verifier would have complained already, if a shift had float mode.

This fixes backend/shift2.c.

All callers use X86_SIZE_32.
Also any smaller size requires a third operand, because the result register does not get completely overwritten.