[commit: ghc] wip/12368's head updated: DmdAnal: Add a final, safe iteration (7b266c9)

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Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/12368' now includes:

     979baec --without-libcharset disables the use of libcharset
     bedd620 Style changes for UniqFM
     6ed7c47 Document some codegen nondeterminism
     9858552 Use deterministic maps for FamInstEnv
     34085b5 Correct the message displayed for syntax error (#12146)
     64bce8c Add Note [FamInstEnv determinism]
     6e280c2 Utils: Fix `lengthIs` and `lengthExceeds` for negative args
     0481324 Use UniqDFM for InstEnv
     b8cd94d GHC.Stack.CCS: Fix typo in Haddocks
     91fd87e FastString: Reduce allocations of concatFS
     15751f2 FastString: Add IsString instance
     c4a9dca FastString: Supply mconcat implementation
     fc53d36 OccName: Implement startsWithUnderscore in terms of headFS
     eb3d659 OccName: Avoid re-encoding derived OccNames
     4f21a51 Kill eltsUFM in classifyTyCons
     6c7c193 DsExpr: Remove usage of concatFS in fingerprintName
     0177c85 Testsuite: expose TEST_CC (path to gcc)
     f53d761 TysWiredIn: Use UniqFM lookup for built-in OccNames
     9a3df1f check-api-annotations utility loads by filename
     17d0b84 Add -package-env to the flags reference
     372dbc4 Pretty: delete really old changelog
     45d8f4e Demand analyser: Implement LetUp rule (#12370)
     18ac80f tidyType: Rename variables of nested forall at once
     cd0750e tidyOccNames: Rename variables fairly
     37aeff6 Added type family dependency to Data.Type.Bool.Not
     b35e01c Bring comments in TcGenGenerics up to date
     a9bc547 Log heap profiler samples to event log
     ffe4660 IfaceEnv: Only check for built-in OccNames if mod is GHC.Types
     24f5f36 Binary: Use ByteString's copy in getBS
     0f0cdb6 Bugfix for bug 11632: `readLitChar` should consume null characters
     1ba79fa CodeGen: Way to dump cmm only once (#11717)
     89a8be7 Pretty: remove a harmful $! (#12227)
     5df92f6 hp2ps: fix invalid PostScript for names with parentheses
     d213ab3 Fix misspellings of the word "instance" in comments
     3fa3fe8 Make DeriveFunctor work with unboxed tuples
     514c4a4 Fix Template Haskell reification of unboxed tuple types
     1fc41d3 Make okConIdOcc recognize unboxed tuples
     0df3f4c Fix PDF build for the User's Guide.
     98b2c50 Support SCC pragmas in declaration context
     e46b768 Make Data.{Bifoldable,Bitraversable} -XSafe
     908f8e2 TcInteract: Add braces to matchClassInst trace output
     8de6e13 Fix bytecode generator panic
     cac3fb0 Cleanup PosixSource.h
     a0f83a6 Data.Either: Add fromLeft and fromRight (#12402)
     627c767 Update docs for partial type signatures (#12365)
     ed48098 InstEnv: Ensure that instance visibility check is lazy
     9513fe6 Clean up interaction between name cache and built-in syntax
     a4f2b76 testsuite: Add regression test for #12381
     93acc02 Add another testcase for #12082
     cf989ff Compact Regions
     83e4f49 Revert "Clean up interaction between name cache and built-in syntax"
     714bebf Implement unboxed sum primitive type
     a09c0e3 Comments only
     9c54185 Comments + tiny refactor of isNullarySrcDataCon
     8d4760f Comments re ApThunks + small refactor in mkRhsClosure
     6a4dc89 Bump Haddock submodule
     7b266c9 DmdAnal: Add a final, safe iteration