fix a compiler crash in certain vardecl initialization expressions

codeOptimizers/src/prog8/optimizer/ConstantIdentifierReplacer.kt

@@ -28,6 +28,7 @@ class VarConstantValueTypeAdjuster(private val program: Program, private val err
                     errors.err("refused rounding of float to avoid loss of precision", decl.value!!.position)
                 } else {
                     // cast the numeric literal to the appropriate datatype of the variable
+                    declConstValue.linkParents(decl)
                     val cast = declConstValue.cast(decl.datatype)
                     if (cast.isValid)
                         return listOf(IAstModification.ReplaceNode(decl.value!!, cast.valueOrZero(), decl))

compiler/test/ast/TestVariousCompilerAst.kt

@@ -376,6 +376,17 @@ main {
         &ubyte[8] array = &mappedvar
         cx16.r0 = &array
     }
+}"""
+        compileText(VMTarget(), optimize=false, src, writeAssembly=false) shouldNotBe null
+    }
+
+    test("sizeof number const evaluation in vardecl") {
+        val src="""
+main {
+    sub start() {
+        uword @shared size1 = sizeof(22222)
+        uword @shared size2 = sizeof(2.2)
+    }
 }"""
         compileText(VMTarget(), optimize=false, src, writeAssembly=false) shouldNotBe null
     }

examples/test.p8

@@ -1,15 +1,18 @@
 %import textio
-%import floats
-%zeropage basicsafe
 
 main {
     sub start() {
-        txt.print("enter number: ")
-        str buffer = "???????????????????????????"
-        void txt.input_chars(buffer)
-        float value = floats.parse_f(buffer)
+        uword size1 = sizeof(22222)
+        txt.print_uw(size1)
         txt.nl()
-        floats.print_f(value)
+        uword size2 = sizeof(2.2)
+        txt.print_uw(size2)
+        txt.nl()
+        cx16.r0 = sizeof(22222)
+        txt.print_uw(cx16.r0)
+        txt.nl()
+        cx16.r0 = sizeof(2.2)
+        txt.print_uw(cx16.r0)
         txt.nl()
     }
 }