Clang: Use full paths in compilation database for symbol collector

We we FilePath and NativeFilePath so that compiler warns us if we mix them
up.

Change-Id: I33d7abc7e4e724dff2a9b2b9b23deea8b358ccfd
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/libs/utils/smallstringview.h

@@ -90,8 +90,7 @@ public:
     SmallStringView(const String &string) noexcept
         : m_pointer(string.data()),
           m_size(string.size())
-    {
-    }
+    {}
 
     static
     SmallStringView fromUtf8(const char *const characterPointer)