[NFCI][Globals] In GlobalObjects::setSectionPrefix, do conditional update if existing prefix is not equivalent to the new one. Returns whether prefix changed. (#158460) Before this change, `setSectionPrefix` overwrites existing section prefix with new one unconditionally. After this change, `setSectionPrefix` checks for equivalences, updates conditionally and returns whether an update happens. Update the existing callers to make use of the return value. [PR 155337](https://github.com/llvm/llvm-project/pull/155337/files#diff-cc0c67ac89807f4453f0cfea9164944a4650cd6873a468a0f907e7158818eae9) is a motivating use case whether the 'update' semantic is needed.
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