Parser debugging/testing improvements

* Set objectname on all parsers to be able to distinguish between
   them more easily when debugging
 * Add some unit tests about pass-through of data we need in the
   gcc parser to the parsers that enhd up in front of the gcc parser
   This is to address QTCREATORBUG-1917.

src/plugins/projectexplorer/ldparser.cpp

@@ -43,6 +43,7 @@ namespace {
 
 LdParser::LdParser()
 {
+    setObjectName(QLatin1String("LdParser"));
     m_regExpLinker.setPattern(QString::fromLatin1(FILE_PATTERN) + '(' + QLatin1String(POSITION_PATTERN) + ")?\\s(.+)$");
     m_regExpLinker.setMinimal(true);