Build and archive r8 mapping

Bug: b/274735214
Change-Id: I8687adf5d3f10096cd7a986c40192a4253784c72
diff --git a/build.gradle b/build.gradle
index e614057..fe2980a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1027,6 +1027,7 @@
             input,
             "--output", output,
             "--pg-map-output", output + ".map",
+            "--partition-map-output", output + "_map.zip",
             "--lib", org.gradle.internal.jvm.Jvm.current().javaHome,
     ] + args + libs.collectMany { ["--lib", it] } + pgConfs.collectMany { ["--pg-conf", it] }
     return baseR8CommandLine(allArgs)