…bol.c

…toObjFile()

…ssary symbol emission
Template constraint evaluation may instantiate exactly same symbols multiple times (eg. issue 10133 test case in test/runnable/funclit.d).
It would cause linker error "duplicate COMDAT" in Win64. To avoid the issue, dmd should elide unnecessary symbol emission.
If a template is instantiated in template constraint or static condition, it's marked as speculative instantiation.
If no other code at non-speculative context refer the instance, compiler will elide its code generation.

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9rnsr mentioned this pull request

Merged