Fixed int64 to double cast warning.
Fixed int64 to double cast warning.

eliben/benchmark,disconnect3d/benchmark,nickhutchinson/benchmark,efcs/benchmark,chemhack/benchmark,eliben/benchmark,everbase/benchmark,ntx-/benchmark,nickhutchinson/benchmark-cxx03,fuchsia-mirror/third_party-benchmark,LepelTsmok/benchmark,mockingbirdnest/benchmark,chemhack/benchmark,disconnect3d/benchmark,ntx-/benchmark,fuchsia-mirror/third_party-benchmark,codygray/benchmark,codygray/benchmark,google/benchmark,eliben/benchmark,LepelTsmok/benchmark,efcs/benchmark,xlqian/benchmark,codygray/benchmark,nickhutchinson/benchmark-cxx03,nickhutchinson/benchmark,xlqian/benchmark,LepelTsmok/benchmark,everbase/benchmark,efcs/benchmark,ntx-/benchmark,disconnect3d/benchmark,mockingbirdnest/benchmark,everbase/benchmark,efcs/benchmark,google/benchmark,chemhack/benchmark,mockingbirdnest/benchmark,google/benchmark,xlqian/benchmark,xlqian/benchmark,nickhutchinson/benchmark,everbase/benchmark,chemhack/benchmark,nickhutchinson/benchmark-cxx03,fuchsia-mirror/third_party-benchmark,LepelTsmok/benchmark,ntx-/benchmark,disconnect3d/benchmark,codygray/benchmark,eliben/benchmark,nickhutchinson/benchmark-cxx03,nickhutchinson/benchmark,mockingbirdnest/benchmark,fuchsia-mirror/third_party-benchmark