gl_shader_disk_cache: Save GLSL and entries into the precompiled file

src/video_core/shader/shader_ir.h

@@ -236,6 +236,11 @@ private:
 
 class ConstBuffer {
 public:
+    explicit ConstBuffer(u32 max_offset, bool is_indirect)
+        : max_offset{max_offset}, is_indirect{is_indirect} {}
+
+    ConstBuffer() = default;
+
     void MarkAsUsed(u64 offset) {
         max_offset = std::max(max_offset, static_cast<u32>(offset));
     }
@@ -252,6 +257,10 @@ public:
         return max_offset + sizeof(float);
     }
 
+    u32 GetMaxOffset() const {
+        return max_offset;
+    }
+
 private:
     u32 max_offset{};
     bool is_indirect{};