recompiler: allow a shader to be refused instead of aborting

A shader the recompiler cannot translate is a gap in emulation, not a reason to
take the process down: skipping the draw or dispatch that wanted it costs some
rendering, while aborting costs the title.

CompileOptions gains non_fatal and CompileResult gains unsupported. With
non_fatal set, the three places the recompile path gives up - an opcode with no
IR translation, a CFG that will not build, and resource tracking that cannot
resolve a descriptor - record the failure and unwind rather than calling EXIT,
and Recompile returns a result marked unsupported. The caller skips that draw or
dispatch. Nothing changes when non_fatal is clear.

Marvel's Spider-Man: Miles Morales meets an untranslatable compute shader on its
third frame, so a strict build cannot pass the opening logo. Astro's Playroom is
also stopped by a shader today and reaches a later, different failure with this
in place.

src/graphics/shader/recompiler/ShaderRecompiler.h

@@ -26,6 +26,7 @@ struct CompileOptions {
 	IR::SrtMemoryReader         read_specialization_memory = nullptr;
 	void*                       read_memory_data           = nullptr;
 	ShaderStageInputInfo        input_info;
+	bool                        non_fatal                  = false;
 };
 
 struct CompileResult {
@@ -34,6 +35,7 @@ struct CompileResult {
 	std::string           ir_dump;
 	IR::Program           program;
 	IR::ResourceSnapshot  resources;
+	bool                  unsupported = false;
 };
 
 [[nodiscard]] CompileResult Recompile(std::span<const uint32_t> code,