[#313] Carry annotations for typed PAIR

Description

Problem: Currently annotations for instructions are inherited from notes that are stored on the 'HST' during typecheck. Such behaviour can produce invalid field annotations for 'PAIR' instruction in case of special annotations (such as '%@').

Solution: Carry annotations for typed PAIR instructions separately, so that we are sure they are the same as for initial untyped instruction.

Related issue(s)

Resolves #313 (closed)

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