efriedma-quic wrote:

(For reference, this was reapplied in #110051.)

I'm not anticipating significant performance regressions here in normal usage: 
all the bits that are getting initialized are padding adjacent to initialized 
fields, so I expect the additional initialization will usually be free, and 
cheap in edge cases where it isn't free.  There's a chance of regressions in 
some edge cases, but that doesn't seem like enough to warrant an option.

Could you clarify which parts of this you'd want to disable?  Handling for all 
variables?  Handling for local variables?  Handling for variables where C23 
rules don't require zero-init?

https://github.com/llvm/llvm-project/pull/97121
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