Don't write nonexistent DEX file paths to dexpreopt.config files.

A path to an nonexistent file caused dex2oat to write an empty path in
the class loader context stored inside of the OAT/ODEX file, which
resulted in class loader context mistmatch and a failure to load
dexpreopt code on device.

An example of a faulty class loader context for GoogleDialer, can be
seen either with oatdump or by grepping logcat for class loader context
mimatch messages (the first empty PCL[] is expected, note the second
empty PCL[] in the subcontext for shared libraries):

  PCL[]{PCL[]#PCL[/system/framework/org.apache.http.legacy.jar*22205474]

This CL removes the nonexistent path from the generated dexpreopt.config
file, which works in conjunction with a change in makefiles that stops
using the removed config field. This is possible because makefiles can
access DEX files using a module name and "intermediates-dir-for" macro.

Bug: 132357300
Test: lunch cf_x86_64_phone-userdebug && m && launch_cvd \
      adb wait-for-device && adb root && adb logcat \
      | grep -E 'ClassLoaderContext [a-z ]+ mismatch'
      # empty grep output, no errors
Change-Id: I8d16f77c6f76ad6234cc4114ad3545cbe572ef13

java/dexpreopt.go

@@ -129,8 +129,6 @@ func (d *dexpreopter) dexpreopt(ctx android.ModuleContext, dexJarFile android.Wr
 
 	dexLocation := android.InstallPathToOnDevicePath(ctx, d.installPath)
 
-	buildPath := android.PathForModuleOut(ctx, "dexpreopt", ctx.ModuleName()+".jar").OutputPath
-
 	providesUsesLib := ctx.ModuleName()
 	if ulib, ok := ctx.Module().(ProvidesUsesLib); ok {
 		name := ulib.ProvidesUsesLib()
@@ -146,7 +144,6 @@ func (d *dexpreopter) dexpreopt(ctx android.ModuleContext, dexJarFile android.Wr
 		slimDexpreoptConfig := &dexpreopt.ModuleConfig{
 			Name:                 ctx.ModuleName(),
 			DexLocation:          dexLocation,
-			BuildPath:            buildPath,
 			EnforceUsesLibraries: d.enforceUsesLibs,
 			ProvidesUsesLibrary:  providesUsesLib,
 			ClassLoaderContexts:  d.classLoaderContexts,
@@ -218,7 +215,7 @@ func (d *dexpreopter) dexpreopt(ctx android.ModuleContext, dexJarFile android.Wr
 	dexpreoptConfig := &dexpreopt.ModuleConfig{
 		Name:            ctx.ModuleName(),
 		DexLocation:     dexLocation,
-		BuildPath:       buildPath,
+		BuildPath:       android.PathForModuleOut(ctx, "dexpreopt", ctx.ModuleName()+".jar").OutputPath,
 		DexPath:         dexJarFile,
 		ManifestPath:    d.manifestFile,
 		UncompressedDex: d.uncompressedDex,