cmd: update golang.org/x/arch for riscv64 disassembler

Update to a newer version of golang.org/x/arch, in order to bring in
changes to the riscv64 disassembler, including support for vector and
zicond instructions:

  go get golang.org/x/arch@fea4a9e
  go mod tidy
  go mod vendor

Change-Id: I19623f76a63cee7d0f83d9f6c2305554ed5d5efb
Reviewed-on: https://go-review.googlesource.com/c/go/+/714140
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Alan Donovan <[email protected]>
Reviewed-by: Alan Donovan <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Joel Sing <[email protected]>

Author: 4a6f656c

src/cmd/go.mod

@@ -4,7 +4,7 @@ go 1.26
 
 require (
 	github.com/google/pprof v0.0.0-20250630185457-6e76a2b096b5
-	golang.org/x/arch v0.20.1-0.20250808194827-46ba08e3ae58
+	golang.org/x/arch v0.22.1-0.20251016010524-fea4a9ec4938
 	golang.org/x/build v0.0.0-20250806225920-b7c66c047964
 	golang.org/x/mod v0.29.0
 	golang.org/x/sync v0.17.0

src/cmd/go.sum

@@ -6,8 +6,8 @@ github.com/ianlancetaylor/demangle v0.0.0-20250417193237-f615e6bd150b h1:ogbOPx8
 github.com/ianlancetaylor/demangle v0.0.0-20250417193237-f615e6bd150b/go.mod h1:gx7rwoVhcfuVKG5uya9Hs3Sxj7EIvldVofAWIUtGouw=
 github.com/yuin/goldmark v1.6.0 h1:boZcn2GTjpsynOsC0iJHnBWa4Bi0qzfJjthwauItG68=
 github.com/yuin/goldmark v1.6.0/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-golang.org/x/arch v0.20.1-0.20250808194827-46ba08e3ae58 h1:uxPa6+/WsUfzikIAPMqpTho10y4qtYpINBurU+6NrHE=
-golang.org/x/arch v0.20.1-0.20250808194827-46ba08e3ae58/go.mod h1:bdwinDaKcfZUGpH09BB7ZmOfhalA8lQdzl62l8gGWsk=
+golang.org/x/arch v0.22.1-0.20251016010524-fea4a9ec4938 h1:VJ182b/ajNehMFRltVfCh/FR0jAH+QX6hs9zqYod/mU=
+golang.org/x/arch v0.22.1-0.20251016010524-fea4a9ec4938/go.mod h1:dNHoOeKiyja7GTvF9NJS1l3Z2yntpQNzgrjh1cU103A=
 golang.org/x/build v0.0.0-20250806225920-b7c66c047964 h1:yRs1K51GKq7hsIO+YHJ8LsslrvwFceNPIv0tYjpcBd0=
 golang.org/x/build v0.0.0-20250806225920-b7c66c047964/go.mod h1:i9Vx7+aOQUpYJRxSO+OpRStVBCVL/9ccI51xblWm5WY=
 golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=