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/linuxiccparser.cpp

@@ -38,6 +38,7 @@ using namespace ProjectExplorer;
 LinuxIccParser::LinuxIccParser()
     : m_expectFirstLine(true), m_indent(0), m_temporary(Task())
 {
+    setObjectName(QLatin1String("LinuxIccParser"));
     // main.cpp(53): error #308: function \"AClass::privatefunc\" (declared at line 4 of \"main.h\") is inaccessible
 
     m_firstLine.setPattern("^([^\\(\\)]+)"           // filename (cap 1)