reshape of BigInt ranges leads to errors due to implicit conversion of dims to Int

[jishnub]

julia> reshape(big(1):big(2)^62, 2, :) # works as expected
2×2305843009213693952 reshape(::UnitRange{BigInt}, 2, 2305843009213693952) with eltype BigInt:
 1  3  5  7   9  11  13  15  17  19  21  23  25  27  29  31  33  35  37  39  41  43  45  …  4611686018427387899  4611686018427387901  4611686018427387903
 2  4  6  8  10  12  14  16  18  20  22  24  26  28  30  32  34  36  38  40  42  44  46     4611686018427387900  4611686018427387902  4611686018427387904

julia> reshape(big(1):big(2)^63, 2, :) # strange error message because of Int overflow
ERROR: DimensionMismatch("parent has 9223372036854775808 elements, which is incompatible with size (2, 4611686018427387904)")
Stacktrace:
 [1] _throw_dmrs(n::BigInt, str::String, dims::Tuple{Int64, Int64})
   @ Base ./reshapedarray.jl:181
 [2] _reshape(parent::UnitRange{BigInt}, dims::Tuple{Int64, Int64})
   @ Base ./reshapedarray.jl:176
 [3] reshape
   @ ./reshapedarray.jl:112 [inlined]
 [4] reshape(parent::UnitRange{BigInt}, dims::Tuple{Int64, Colon})
   @ Base ./reshapedarray.jl:118
 [5] reshape(::UnitRange{BigInt}, ::Int64, ::Colon)
   @ Base ./reshapedarray.jl:117
 [6] top-level scope
   @ REPL[10]:1

julia> reshape(big(1):big(2)^64, 2, :) # clearer error message, but perhaps this should work? 
ERROR: InexactError: Int64(9223372036854775808)
Stacktrace:
 [1] Type
   @ ./gmp.jl:364 [inlined]
 [2] _reshape_uncolon
   @ ./reshapedarray.jl:129 [inlined]
 [3] reshape(parent::UnitRange{BigInt}, dims::Tuple{Int64, Colon})
   @ Base ./reshapedarray.jl:118
 [4] reshape(::UnitRange{BigInt}, ::Int64, ::Colon)
   @ Base ./reshapedarray.jl:117
 [5] top-level scope
   @ REPL[11]:1