ClangSupport: Use simpler structures in some cases

The patch is mostly mechanical, but contains also a few spurious changes
from values references for some local variables, foreach -> ranged for
etc that I coulnd't resist.

Change-Id: I58f0bd972546895eb318607cbfbd7ac35caf3f23
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/libs/clangsupport/sourcerangesanddiagnosticsforquerymessage.cpp

@@ -30,8 +30,8 @@ namespace ClangBackEnd {
 QDebug operator<<(QDebug debug, const SourceRangesAndDiagnosticsForQueryMessage &message)
 {
     debug.nospace() << "SourceRangesAndDiagnosticsForQueryMessage("
-                    <<  message.sourceRanges() << ", "
-                     << message.diagnostics() << ")";
+                    <<  message.sourceRanges << ", "
+                     << message.diagnostics << ")";
 
     return debug;
 }