[5.8][BuilderTransform] Rework missing buildWithLimitedAvailability
detection
#63807
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Cherry-pick of #63768
Fixes a crash in diagnostic code that is trying to determine
whether
buildWithLimitedAvailability
should be added tothe result builder.
Since all of the branches of an
if
statement are joinedtogether and hence produce the same type, that type
should be used to check whether
buildWithLimitedAvailability
is required but missing regardless of availability condition kind.
Scope: Result builder transformed closures/functions with
if #unavailable
statements withoutelse
branch.Main Branch PR: [BuilderTransform] Rework missing
buildWithLimitedAvailability
detection #63768Resolves: rdar://105734854
Risk: Very Low
Reviewed By: @hborla
Testing: Added a regression test-case to the suite.
Resolves: rdar://105734854
Resolves: #63764 (cherry picked from commit c4ea02c)