[commit: ghc] wip/T14068's head updated: Merge branch 'wip/T14951' into wip/T14068 (4a47fd3)

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

Branch 'wip/T14068' now includes:

     2a3702d Comments and tiny refactor
     5a1ad23 Update test for #5129:
     f9a6d42 Add a build with 32bit Ubuntu container
     2918abf rts: Add --internal-counters RTS flag and several counters
     3d378d9 Also check local rules with -frules-check
     39c7406 Be more selective in which conditionals we invert
     fad822e Improve the warning message of qualified unused imports.
     0db0e46 Get rid of more CPP in cmm/ and codeGen/
     bbcea13 Hoopl: improve postorder calculation
     a00b88b Implement -dword-hex-literals
     b37a87b PPC nativeGen: Add support for MO_SS_Conv_W32_W64
     5241f29 SPARC nativeGen: Support for MO_SS_Conv_W32_W64
     d27336e [RFC] nativeGen: Add support for MO_SS_Conv_W32_W64 on i386
     20cbb01 Improve accuracy of get/setAllocationCounter
     256577f CmmUtils: get rid of insertBlock
     fbd9b88 Implement equalKeysUFM the right way
     9868f91 Turn a TH Name for built-in syntax into an unqualified RdrName
     e358854 Require GHC 8.2 to bootstrap GHC
     c3aea39 Fix #14934 by including axSub0R in typeNatCoAxiomRules
     f748c52 Don't permit data types with return kind Constraint
     fdec06a Update tests for #12870 to pass with a slow run of the testsuite.
     98c1f22 Bump array submodule
     960cd42 Fix typo in user guide about ConstraintKinds
     82e8d1f Fix typo
     b3b394b gen-data-layout.sh: Use bash array for readability
     2d4bda2 rts, base: Refactor stats.c to improve --machine-readable report
     afad556 Add -flate-specialise which runs a later specialisation pass
     6a71ef7 Bump autoconf version bound to >= 2.69
     d718023 relnotes: Fix parsing of Version: field from Cabal file
     60aa53d configure: Accept version suffix in solaris name
     57001d9 Update T5129 test:
     0a778eb Revert "rts, base: Refactor stats.c to improve --machine-readable report"
     abaf43d Fix seq# case of exprOkForSpeculation
     c663b71 Run SpecConstr only once again
     a5555df Create stronger ArgOccs from calls to specialized functions
     b855db7 Improve and write Note about cascading specialization
     0aa7d87 Do cascading SpecConstr also for non-recursive bindings
     4a47fd3 Merge branch 'wip/T14951' into wip/T14068