Build stabilization (#413)

* shader_recompiler: fix for float convert and debug asserts

* libraries: kernel: correct return code on invalid semaphore

* amdgpu: additional case for cb extents retrieval heuristic

* removed redundant check in assert

* amdgpu: fix for linear tiling mode detection fin color buffers

* texture_cache: fix for unexpected scheduler flushes by detiler

* renderer_vulkan: missing depth barrier

* texture_cache: missed slices in rt view; + detiler format

src/video_core/buffer_cache/buffer.h

@@ -146,6 +146,10 @@ public:
         return offset;
     }
 
+    u64 GetFreeSize() const {
+        return size_bytes - offset - mapped_size;
+    }
+
 private:
     struct Watch {
         u64 tick{};