cmd/vet: add arm64 asmdecl support
cmd/vet: add arm64 asmdecl support

Change-Id: I5ab54616488bc9bc41aefb27b45d72c36fc4fbde
Reviewed-on: https://go-review.googlesource.com/9211
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

cw2018/tools,springning/tools,jdhenke/tools,glasser/golang-tools,nicot/tools,cw2018/tools,josharian/tools,nicot/tools,argandas/tools,matryer/tools,golang/tools,springning/tools,argandas/tools,runcom/tools,magiccao/tools,golang/tools,runcom/tools,sshetty10/tools,argandas/tools,golang/tools,springning/tools,runcom/tools,syreclabs/go-tools,jdhenke/tools,matryer/tools,glasser/golang-tools,sshetty10/tools,golang/tools,cw2018/tools,matryer/tools,magiccao/tools,golang/tools,glasser/golang-tools,cmars/tools,cmars/tools,nicot/tools,cw2018/tools,josharian/tools,syreclabs/go-tools,jdhenke/tools,runcom/tools,argandas/tools,syreclabs/go-tools,jdhenke/tools,sshetty10/tools,sshetty10/tools,syreclabs/go-tools,josharian/tools,cmars/tools,syreclabs/go-tools,magiccao/tools,cmars/tools,josharian/tools,glasser/golang-tools,magiccao/tools,nicot/tools,syreclabs/go-tools,matryer/tools,springning/tools