[PATCH v2] Avoid unnecessarily numbered clone symbols

[Michael Ploujnikov]

Continuing from https://gcc.gnu.org/ml/gcc-patches/2018-10/msg01258.html

Fixed up the code after the change to concat suggested by Bernhard
Reutner.

Outstanding question still remains:

To write an exact replacement for numbered_clone_function_name (apart
from the numbering) I also need to copy the double underscore
prefixing behaviour done by ASM_PN_FORMAT (right?)  which is used by
ASM_FORMAT_PRIVATE_NAME. Does that mean that I can't use my
suffixed_function_name to replace the very similar looking code in
cgraph_node::create_virtual_clone? Or is it just missing the double
underscore prefix by mistake?


- Michael
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