Incorrect offsets for array size indexing

There are several cases in the array code generation where a byte offset is used when a word offset is needed. For example (context):

emitPrimOp dflags [res] SizeofSmallArrayOp [arg] =
    emit $ mkAssign (CmmLocal res)
    (cmmLoadIndexW dflags arg
     (fixedHdrSizeW dflags + oFFSET_StgSmallMutArrPtrs_ptrs dflags) (bWord dflags))

This only works because oFFSET_StgSmallMutArrPtrs_ptrs dflags is zero.

I don't have time to fix this now, but I'm reporting it so it isn't forgotten.

Trac metadata

Trac field	Value
Version	7.10.1
Type	Task
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler (CodeGen)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	simonmar
Operating system
Architecture