Split DWARF is missing macro support

[philipc]

When we added macro parsing support, this code should have been updated too:

gimli/src/read/dwarf.rs

Lines 1105 to 1107 in 9468200

	IndexSectionId::DebugMacro | IndexSectionId::DebugMacinfo => {
	// These are valid but we can't parse these yet.
	}