Simplify jiri swift build stage names.

Currently the stage names have a redundency in being called build-cgo
and build-framework as you must specify the build command to use them.
This CL simplifies build commands from "jiri swift build build-cgo" to
"jiri swift build cgo".

Change-Id: I4d0c5ef469af4c3c7f764af090f83dccf2a0ace1
diff --git a/jiri-swift/build_test.go b/jiri-swift/build_test.go
index 789685d..af10657 100644
--- a/jiri-swift/build_test.go
+++ b/jiri-swift/build_test.go
@@ -140,7 +140,7 @@
 	}
 	// Cgo binary
 	resetVars()
-	if err := parseBuildArgs(jirix, []string{"build-cgo"}); err != nil {
+	if err := parseBuildArgs(jirix, []string{"cgo"}); err != nil {
 		t.Error(err)
 		return
 	}
@@ -150,7 +150,7 @@
 	}
 	// Cgo binary + framework
 	resetVars()
-	if err := parseBuildArgs(jirix, []string{"build-cgo", "build-framework"}); err != nil {
+	if err := parseBuildArgs(jirix, []string{"cgo", "framework"}); err != nil {
 		t.Error(err)
 		return
 	}
@@ -161,7 +161,7 @@
 	// Framework requires universal
 	resetVars()
 	flagTargetArch = targetArchAmd64
-	if err := parseBuildArgs(jirix, []string{"build-cgo", "build-framework"}); err == nil {
+	if err := parseBuildArgs(jirix, []string{"cgo", "framework"}); err == nil {
 		t.Error("Expected error building framework for 1 architecture")
 		return
 	}
diff --git a/jiri-swift/swift.go b/jiri-swift/swift.go
index a532859..4f26e52 100644
--- a/jiri-swift/swift.go
+++ b/jiri-swift/swift.go
@@ -47,8 +47,8 @@
 	frameworkName       = "VanadiumCore.framework"
 	frameworkBinaryName = "VanadiumCore"
 
-	stageBuildCgo       = "build-cgo"
-	stageBuildFramework = "build-framework"
+	stageBuildCgo       = "cgo"
+	stageBuildFramework = "framework"
 
 	descBuildMode   = "The build mode for cgo, either c-archive or c-shared. Defaults to c-archive."
 	descBuildDirCgo = "The directory for all generated artifacts during the cgo building phase. Defaults to a temp dir."
@@ -87,14 +87,14 @@
 	Short:  "Builds and installs the cgo wrapper, as well as the Swift framework",
 	Long: `The complete build pipeline from creating the CGO library, manipulating the headers for Swift,
 	and building the Swift framework using Xcode.`,
-	ArgsName: "[stage ...] (build-cgo, build-framework)",
+	ArgsName: "[stage ...] (cgo, framework)",
 	ArgsLong: `
 	[stage ...] are the pipelines stage to run and any arguments to pass to that stage. If left empty defaults
 	to building all stages.
 
 	Available stages:
-		build-cgo: Builds and installs the cgo library
-		build-framework: Builds the Swift Framework using Xcode
+		cgo: Builds and installs the cgo library
+		framework: Builds the Swift Framework using Xcode
 	`,
 }
 
diff --git a/jiridoc/doc.go b/jiridoc/doc.go
index 4f54ca3..10ba2ac 100644
--- a/jiridoc/doc.go
+++ b/jiridoc/doc.go
@@ -1473,15 +1473,15 @@
 	and building the Swift framework using Xcode.
 
 Usage:
-   jiri swift build [flags] [stage ...] (build-cgo, build-framework)
+   jiri swift build [flags] [stage ...] (cgo, framework)
 
 [stage ...] are the pipelines stage to run and any arguments to pass to that
 stage. If left empty defaults
 	to building all stages.
 
 	Available stages:
-		build-cgo: Builds and installs the cgo library
-		build-framework: Builds the Swift Framework using Xcode
+		cgo: Builds and installs the cgo library
+		framework: Builds the Swift Framework using Xcode
 
 The jiri swift build flags are:
  -build-dir-cgo=