LLVM backend does not properly widen certain literal types in call expressions

Related to #7571 (closed) and #7574 (closed), while compiling stage2 with stage1 GHC HEAD on my ODROID, my build fails in libraries/base/GHC/Word.hs with:

linaro@linaro-ubuntu-desktop ~/code/ghc
 % "inplace/bin/ghc-stage1" -static  -H64m -O0 -fasm    -package-name base-4.7.0.0 -hide-all-packages -i -ilibraries/base/. -ilibrarie-Ilibraries/base/dist-install/build -Ilibraries/base/dist-install/build/autogen -Ilibraries/base/include   -optP-DOPTIMISE_INTEGER_GCDl_macros.h -package ghc-prim-0.3.1.0 -package integer-gmp-0.5.1.0 -package rts-1.0  -package-name base -XHaskell98 -XCPP -O -fasm  -no -hidir libraries/base/dist-install/build -stubdir libraries/base/dist-install/build -hisuf hi -osuf  o -hcsuf hc -c libraries/base/./files -tmpdir tmpdir                                                                                                                  
 
when making flags consistent: Warning:
    No native code generator, so using LLVM
You are using a new version of LLVM that hasn't been tested yet!
We will try though...
/home/linaro/bin/opt: tmpdir/ghc12774_0/ghc12774_0.ll:26765:62: error: argument is not of expected type 'i64'
  %lnhvj = call ccc i32 (i64,i64)* @hs_eqWord64( i64 %lnhvi, i32 0 ) nounwind

The declaration of ```hs_eqWord64` is:

{{{ declare ccc i32 @hs_eqWord64(i64, i64) align 4 }}}

And we get:

{{{ %lnhvj = call ccc i32 (i64,i64)* @hs_eqWord64( i64 %lnhvi, i32 0 ) nounwind }}}

inside of c8Aq_info, which has a tail call from the symbol base_GHCziWord_zdfNumWord64zuzdcsignum_info or ```base_GHC.Word_fNumWord64_csignum_info\` - this would seem to be some specialized instance of the case:

instance Num Word64 where
    ...
    signum 0               = 0
    signum _               = 1

1. .. I think. This seems like a fairly simple fix similar to the others, but I'm filing it for now.

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	dterei, simonmar
Operating system	Unknown/Multiple
Architecture	Unknown/Multiple