Build: when using JVM IR, produce stable binaries

This is needed to allow non-JVM-IR modules depend on the modules
compiled by JVM IR. This also allows us to enable JVM IR in our build by
default now, without introducing errors to all external usages of our
compiler and other artifacts that we publish.

build.gradle.kts

@@ -443,6 +443,7 @@ allprojects {
 
             if (useJvmIrBackend) {
                 useIR = true
+                freeCompilerArgs += "-Xir-binary-with-stable-abi"
             }
         }
     }