Revert "Revert "R8/D8 should use sdk_version prop to determine API surface stability.""

This reverts commit 7eb9243fa7.

Reason for revert: The original change was reverted since it was suspected to cause missing libc++.so errors. It was a red herring, and the root cause has been fixed now b/264588525

Change-Id: Ib9110c41bacf220b91f24de11589f63235895e56

java/dex_test.go

@@ -41,6 +41,7 @@ func TestR8(t *testing.T) {
 			name: "core_platform_app",
 			srcs: ["foo.java"],
 			sdk_version: "core_platform",
+			min_sdk_version: "31",
 		}
 
 		java_library {