OPA 0.14 fails to compile on 386

[jpreese]

Expected Behavior

Importing the topdown package allows the project to compile successfully

Actual Behavior

Compilation fails

Steps to Reproduce the Problem

1. Import the topdown package into a project
2. set GOARCH=386
3. go build

Additional Info

stack trace

$ go build
# github.com/open-policy-agent/opa/topdown
C:\Users\jpree\go\pkg\mod\github.com\open-policy-agent\opa@v0.14.0\topdown\parse_bytes.go:84:5: constant 1000000000000 overflows multiplier
C:\Users\jpree\go\pkg\mod\github.com\open-policy-agent\opa@v0.14.0\topdown\parse_bytes.go:86:5: constant 1099511627776 overflows multiplier

go env

$ go env
set GO111MODULE=
set GOARCH=386
set GOBIN=C:\Go\bin
set GOCACHE=C:\Users\jpree\AppData\Local\go-build
set GOENV=C:\Users\jpree\AppData\Roaming\go\env
set GOEXE=.exe
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\jpree\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=c:\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=c:\go\pkg\tool\windows_amd64
set GCCGO=gccgo
set GO386=sse2
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=0
set GOMOD=C:\k2\conftest\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m32 -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=C:\Users\jpree\AppData\Local\Temp\go-build389625958=/tmp/go-build -gno-record-gcc-switches