Optimize CPU time when running d8 and r8 am: 6db4d4e613

am: f334ea833f

Change-Id: I371eef5fdadd6cc4ba4dcb5dd7445fd845a0109c

java/config/config.go

@@ -61,6 +61,7 @@ func init() {
 
 	pctx.StaticVariable("JavacHeapSize", "2048M")
 	pctx.StaticVariable("JavacHeapFlags", "-J-Xmx${JavacHeapSize}")
+	pctx.StaticVariable("DexFlags", "-JXX:+TieredCompilation -JXX:TieredStopAtLevel=1")
 
 	pctx.StaticVariable("CommonJdkFlags", strings.Join([]string{
 		`-Xmaxerrs 9999999`,

java/config/makevars.go

@@ -81,4 +81,6 @@ func makeVarsProvider(ctx android.MakeVarsContext) {
 
 	ctx.Strict("CLASS2GREYLIST", "${Class2Greylist}")
 	ctx.Strict("HIDDENAPI", "${HiddenAPI}")
+
+	ctx.Strict("DEX_FLAGS", "${DexFlags}")
 }

java/dex.go

@@ -25,7 +25,7 @@ import (
 var d8 = pctx.AndroidStaticRule("d8",
 	blueprint.RuleParams{
 		Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
-			`${config.D8Cmd} --output $outDir $d8Flags $in && ` +
+			`${config.D8Cmd} ${config.DexFlags} --output $outDir $d8Flags $in && ` +
 			`${config.SoongZipCmd} $zipFlags -o $outDir/classes.dex.jar -C $outDir -f "$outDir/classes*.dex" && ` +
 			`${config.MergeZipsCmd} -D -stripFile "**/*.class" $out $outDir/classes.dex.jar $in`,
 		CommandDeps: []string{
@@ -40,7 +40,7 @@ var r8 = pctx.AndroidStaticRule("r8",
 	blueprint.RuleParams{
 		Command: `rm -rf "$outDir" && mkdir -p "$outDir" && ` +
 			`rm -f "$outDict" && ` +
-			`${config.R8Cmd} -injars $in --output $outDir ` +
+			`${config.R8Cmd} ${config.DexFlags} -injars $in --output $outDir ` +
 			`--force-proguard-compatibility ` +
 			`--no-data-resources ` +
 			`-printmapping $outDict ` +