Jacob Lambert 11a6799740 [clang][CodeGen] Omit pre-opt link when post-opt is link requested (#85672) ...

Currently, when the -relink-builtin-bitcodes-postop option is used we
link builtin bitcodes twice: once before optimization, and again after
optimization.

With this change, we omit the pre-opt linking when the option is set,
and we rename the option to the following:

  -Xclang -mlink-builtin-bitcodes-postopt
 (-Xclang -mno-link-builtin-bitcodes-postopt) 

The goal of this change is to reduce compile time. We do lose the
theoretical benefits of pre-opt linking, but in practice these are small
than the overhead of linking twice. However we may be able to address
this in a future patch by adjusting the position of the builtin-bitcode
linking pass.

Compilations not setting the option are unaffected

2024-05-08 08:11:15 -07:00

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