VariableAnalysisSniff::checkForSymbolicObjectProperty(): fix comment tolerance (#154)

PHP ignores comments in unexpected/unconventional places and so should the sniff.

Includes adjusting an existing unit test.

Without the fix, the adjusted unit test would cause test failures.

Author: jrfnl

VariableAnalysis/Sniffs/CodeAnalysis/VariableAnalysisSniff.php

@@ -1100,7 +1100,7 @@ protected function checkForSymbolicObjectProperty(File $phpcsFile, $stackPtr, $v
 
     // Are we a symbolic object property/function derefeference?
     // Search backwards for first token that isn't whitespace, is it a "->" operator?
-    $objectOperatorPtr = $phpcsFile->findPrevious(T_WHITESPACE, $stackPtr - 1, null, true, null, true);
+    $objectOperatorPtr = $phpcsFile->findPrevious(Tokens::$emptyTokens, $stackPtr - 1, null, true, null, true);
     if (($objectOperatorPtr === false) || ($tokens[$objectOperatorPtr]['code'] !== T_OBJECT_OPERATOR)) {
       return false;
     }

VariableAnalysis/Tests/CodeAnalysis/fixtures/ClassReferenceFixture.php

@@ -8,7 +8,7 @@ function method_with_symbolic_ref_property() {
             $this->$property = 'some value';
             $this -> $property = 'some value';
             $this->$undefined_property = 'some value';
-            $this -> $undefined_property = 'some value';
+            $this -> /* comment*/ $undefined_property = 'some value';
             $this->$ignored_property = 'some value';
             $this -> $ignored_property = 'some value';
         }