Direct Bazel builds from m.

This CL adds support to bp2build/Soong to dump a BUILD file under
out/soong/soong_injection/targets containing alias targets to their real
targets for every converted Soong module, regardless of whether they are
handcrafted or generated.

Test: TH
Change-Id: Ic1816fda5d019c395301618134fac68b3057d752

bp2build/testing.go

@@ -213,6 +213,6 @@ func customBp2BuildMutatorFromStarlark(ctx android.TopDownMutatorContext) {
 // Helper method for tests to easily access the targets in a dir.
 func generateBazelTargetsForDir(codegenCtx *CodegenContext, dir string) BazelTargets {
 	// TODO: Set generateFilegroups to true and/or remove the generateFilegroups argument completely
-	buildFileToTargets, _ := GenerateBazelTargets(codegenCtx, false)
+	buildFileToTargets, _, _ := GenerateBazelTargets(codegenCtx, false)
 	return buildFileToTargets[dir]
 }