Reflection: Extract new decodeMangledType() for when we have a TypeRefBuilder but not ReflectionContext, NFC
Reflection: Extract new decodeMangledType() for when we have a TypeRefBuilder but not ReflectionContext, NFC

In particular, this will allow the field and associated type metadata
parsing to be moved out of ReflectionContext and into TypeRefBuilder,
which is required for TypeRef lowering.

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