shader: resolve typed phis and ReadFirstLane in the SRT walker

Two descriptor chains this title uses could not be resolved:

- A descriptor whose address arrives through a phi. Walk the phi to its leaves
  and accept the result when they agree, or when exactly one is a real address
  and the rest are null/sentinel.
- A descriptor read through ReadFirstLane. This is safe for non-image
  descriptors, where every lane holds the same handle, so accept it there. Image
  descriptors keep the old restriction, gated by the dword count.

src/graphics/shader/recompiler/ir/passes/ResourceTracking.h

@@ -7,7 +7,7 @@ namespace Libs::Graphics::ShaderRecompiler::IR {
 
 // Collects immutable resource topology from typed SSA handles, interns their resolved dwords in
 // descriptor_sources, then writes dense indices to handle flags and MemoryInfo.
-void TrackResources(Program& program);
+bool TrackResources(Program& program);
 
 } // namespace Libs::Graphics::ShaderRecompiler::IR