instruction scheduling to be enabled with ``-debug-only=InstrSched``, even if
the source lives in multiple files.
+For performance reasons, -debug-only is not available in optimized build
+(``--enable-optimized``) of LLVM.
+
The ``DEBUG_WITH_TYPE`` macro is also available for situations where you would
like to set ``DEBUG_TYPE``, but only for one specific ``DEBUG`` statement. It
takes an additional first parameter, which is the type to use. For example, the