[Cherrypick]Serialize/Deserialize source locations for instructions (#77281) #79578
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Explanation:
This commit adds support for serializing and deserializing source locations for instructions.
Scope:
This is gated behind a flag currently so does not have any effect until enablement.
Original PR:
#77281
Risk:
Low since this does not include enablement of the flag
Testing:
Testing has been done locally while building with the flag enabled, and I have also added tests
Reviewers:
adrian-prantl