Repoting platform declarations clashes in CLI compiler for JVM

#KT-1 In Progress

compiler/testData/cli/jvm/signatureClash.args

@@ -0,0 +1,4 @@
+-src
+$TESTDATA_DIR$/signatureClash.kt
+-output
+$TEMP_DIR$

compiler/testData/cli/jvm/signatureClash.kt

@@ -0,0 +1,7 @@
+class A {
+    fun getA(): Int = 1
+    val a: Int = 1
+}
+
+fun getB(): Int = 1
+val b: Int = 1

compiler/testData/cli/jvm/signatureClash.out

@@ -0,0 +1,5 @@
+ERROR: $TESTDATA_DIR$/signatureClash.kt: (2, 5) Platform declaration clash: 'getA()I'
+ERROR: $TESTDATA_DIR$/signatureClash.kt: (3, 5) Platform declaration clash: 'getA()I'
+ERROR: $TESTDATA_DIR$/signatureClash.kt: (6, 1) Platform declaration clash: 'getB()I'
+ERROR: $TESTDATA_DIR$/signatureClash.kt: (7, 1) Platform declaration clash: 'getB()I'
+COMPILATION_ERROR