[SPIR-V] Improve implementation of the duplicates tracker's storage (#95958) This PR continues https://github.com/llvm/llvm-project/pull/94952, managing FunctionType in the same way as a pointee types in https://github.com/llvm/llvm-project/pull/94952 (that is working with TypedPointers pointee types rather than with original llvm's untyped pointers). This PR also fully reworks the base type for the duplicates tracker's storage to conform with and reuse DenseMapInfo. Previous implementation didn't store enough info to differ between key values (see isEqual() implemented as equality of derived from arguments hash values). This, in turn, led to random crashes in very rare occasions when hash value of an actual key matched hash values of empty and tombstone instances. In this PR we use std::tuple instead of a tailor-made class hierarchy, both reusing DenseMapInfo templates and getting rid of the crash condition.
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