added 'mergeDataWithLocalDeclarations' option

for collecting variable data for pseudocode

  removed using data from outer context
  for local declarations for 'variable initializers' analysis

compiler/testData/cfg-variables/bugs/varInitializationInIf.kt

@@ -0,0 +1,10 @@
+fun foo() {
+    val b: Boolean
+    if (1 < 2) {
+        b = false
+    }
+    else {
+        b = true
+    }
+    use(b)
+}