[moveOnly] Add a new pass called the LexicalLifetimeEliminator that runs after we finish lexical diagnostics. #40162
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…uns after we finish lexical diagnostics. NOTE: This pass is disabled when -enable-experimental-lexical-lifetimes is enabled. When that flag is disabled, this removes the lexical flag from begin_borrow and alloc_stack. This ensures that we can begin using begin_borrow [lexical] and friends to emit diagnostics without impacting performance. I am going to be preparing a subsequent patch that causes us to emit lexical lifetimes by default. Due to this pass, I am not expecting any issues around perf.
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NOTE: This pass is disabled when -enable-experimental-lexical-lifetimes is
enabled.
When that flag is disabled, this removes the lexical flag from begin_borrow and
alloc_stack. This ensures that we can begin using begin_borrow [lexical] and
friends to emit diagnostics without impacting performance. I am going to be
preparing a subsequent patch that causes us to emit lexical lifetimes by
default. Due to this pass, I am not expecting any issues around perf.