[commit: ghc] wip/T10180's head updated: New Lint check: no alternatives implies bottoming expression (13384c1)

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

Branch 'wip/T10180' now includes:

     e25ad04 docs: make gen_contents_index --verbose more verbose
     12a03c4 fix bus error (misaligned data access) on SPARC in __decodeDouble_Int64
     a20cc3d rts: check arguments to flags that don't have any
     5ef5a18 Update integer-gmp2's changelog for release
     cab5b3a Fix integer-gmp source tarball distribution
     992040e Minor fix to Note [Trimming arity]
     b32e049 exprIsBottom should look through type lambdas
     13384c1 New Lint check: no alternatives implies bottoming expression