Optimize CPU time when running d8 and r8 am: 6db4d4e613 am: f334ea833f

am: e6c2c1313c

Change-Id: I3a6b7ec5ca04250ec7e0e333ef64d9cfe6133553

java/config/config.go

@@ -62,6 +62,7 @@ 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}")
 }