translator: fix reassigment, add tests

translator/src/main/kotlin/org/kotlinnative/translator/llvm/LLVMBuilder.kt

@@ -134,9 +134,12 @@ class LLVMBuilder(val arm: Boolean) {
     }
 
     fun copyVariableValue(target: LLVMVariable, source: LLVMVariable) {
-        val tmp = getNewVariable(source.type, source.pointer)
-        llvmLocalCode.appendln("$tmp = load ${source.getType()} $source, align ${tmp.type.align}")
-        llvmLocalCode.appendln("store ${target.type} $tmp, ${target.getType()} $target, align ${tmp.type.align}")
+        var from = source
+        if (source.pointer > 0) {
+            from = getNewVariable(source.type, source.pointer)
+            llvmLocalCode.appendln("$from = load ${source.getType()} $source, align ${from.type.align}")
+        }
+        llvmLocalCode.appendln("store ${target.type} $from, ${target.getType()} $target, align ${from.type.align}")
     }
 
     fun loadArgument(llvmVariable: LLVMVariable, store: Boolean = true): LLVMVariable {

translator/src/test/kotlin/tests/input/reassigment_0.txt

@@ -0,0 +1 @@
+reassigment_0(5) == 6

translator/src/test/kotlin/tests/input/reassigment_1.txt

@@ -0,0 +1 @@
+reassigment_1(5) == 7

translator/src/test/kotlin/tests/kotlin/reassigment_0.kt

@@ -0,0 +1,4 @@
+fun reassigment_0(x: Int): Int {
+    var b = x + 1
+    return b
+}

translator/src/test/kotlin/tests/kotlin/reassigment_1.kt

@@ -0,0 +1,7 @@
+fun reassigment_1(x: Int): Int {
+    var a = x
+    a = a + 1
+    var b = a + 1
+    b = b + 1
+    return b
+}