[patch][pr17918] Use simple section names for COMDAT sections

[Rafael Espíndola]

With the attached patch we use simple names for COMDAT sections (like
.text or .bss). This matches the MSVC behavior.

When merging it is the COMDAT symbol that is used to decide if two
sections should be merged, so there is no point in building a fancy
name.

This survived a bootstrap on mingw32.

Cheers,
Rafael
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