RE: [commit: ghc] master: SrcLoc: Eliminate constructors of RealSrcSpan (987426c)

Simon Peyton Jones writes:

Does this change yield any benefits? Eg. if we can now unbox SrcLoc does something go faster?

Compiler allocations in the testsuite decrease between 0 and 1% [1]. Moreover, it still seemed like a reasonable clean-up given it is a net reduction in code length with no loss of clarity. Cheers, - Ben [1] https://perf.haskell.org/ghc/#table-6