Meghana Gupta 1dc713e2f7 Add new flags "reborrow" and "escaping" to SILArgument. ...

"reborrow" flag on the SILArgument avoids transitive walk over the phi operandsi
to determine if it is a reborrow in multiple utilities.
SIL transforms must keep the flag up-to-date by calling SILArgument::setReborrow.
SILVerifier checks to ensure the flag is not invalidated.

Currently "escaping" is not used anywhere.

2023-05-11 12:31:37 -07:00

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