Nikita Popov f89f7da999 [IR] Convert null-pointer-is-valid into an enum attribute ...

The "null-pointer-is-valid" attribute needs to be checked by many
pointer-related combines. To make the check more efficient, convert
it from a string into an enum attribute.

In the future, this attribute may be replaced with data layout
properties.

Differential Revision: https://reviews.llvm.org/D78862

2020-05-15 19:41:07 +02:00

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