Get rid of CompileKotlinAgainstMultifileKotlinTestGenerated and boxMultifileClasses/

Merge tests in boxMultifileClasses/calls to one test case; copy the two
resulting tests (+ change box to main) to compileKotlinAgainstKotlin

compiler/testData/codegen/boxMultiFile/callsToMultifileClassFromOtherPackage.kt

@@ -0,0 +1,23 @@
+// FILE: 1.kt
+
+import a.*
+
+fun box(): String {
+    if (foo() != "OK") return "Fail function"
+    if (constOK != "OK") return "Fail const"
+    if (valOK != "OK") return "Fail val"
+    varOK = "OK"
+    if (varOK != "OK") return "Fail var"
+
+    return "OK"
+}
+
+// FILE: 2.kt
+
+@file:[JvmName("MultifileClass") JvmMultifileClass]
+package a
+
+fun foo(): String = "OK"
+const val constOK: String = "OK"
+val valOK: String = "OK"
+var varOK: String = "Hmmm?"

compiler/testData/codegen/boxMultifileClasses/calls/callFromOtherPackage.kt

@@ -1,12 +0,0 @@
-// FILE: 1.kt
-
-import a.foo
-
-fun box(): String = foo()
-
-// FILE: 2.kt
-
-@file:[JvmName("MultifileClass") JvmMultifileClass]
-package a
-
-fun foo(): String = "OK"

compiler/testData/codegen/boxMultifileClasses/calls/constFromOtherPackage.kt

@@ -1,12 +0,0 @@
-// FILE: 1.kt
-
-import a.OK
-
-fun box(): String = OK
-
-// FILE: 2.kt
-
-@file:[JvmName("MultifileClass") JvmMultifileClass]
-package a
-
-const val OK: String = "OK"

compiler/testData/codegen/boxMultifileClasses/calls/valFromOtherPackage.kt

@@ -1,12 +0,0 @@
-// FILE: 1.kt
-
-import a.OK
-
-fun box(): String = OK
-
-// FILE: 2.kt
-
-@file:[JvmName("MultifileClass") JvmMultifileClass]
-package a
-
-val OK: String = "OK"

compiler/testData/codegen/boxMultifileClasses/calls/varFromOtherPackage.kt

@@ -1,15 +0,0 @@
-// FILE: 1.kt
-
-import a.OK
-
-fun box(): String {
-    OK = "OK"
-    return OK
-}
-
-// FILE: 2.kt
-
-@file:[JvmName("MultifileClass") JvmMultifileClass]
-package a
-
-var OK: String = "Hmmm?"