[LL API] Run fir2ir separately for files in different modules

Each module may have its own compiler configuration.

^KTIJ-27061 Fixed

analysis/analysis-api/testData/components/compilerFacility/compilationMultiModule/internalUsage.kt

@@ -0,0 +1,15 @@
+// MODULE: lib
+// FILE: lib.kt
+
+package lib
+
+internal fun lib(): String = "foo"
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+import lib.lib
+
+fun test() {
+    lib()
+}