gl_buffer_cache: Remove unused ReserveMemory method

src/video_core/renderer_opengl/gl_buffer_cache.cpp

@@ -71,16 +71,6 @@ GLintptr OGLBufferCache::UploadHostMemory(const void* raw_pointer, std::size_t s
     return uploaded_offset;
 }
 
-std::tuple<u8*, GLintptr> OGLBufferCache::ReserveMemory(std::size_t size, std::size_t alignment) {
-    AlignBuffer(alignment);
-    u8* const uploaded_ptr = buffer_ptr;
-    const GLintptr uploaded_offset = buffer_offset;
-
-    buffer_ptr += size;
-    buffer_offset += size;
-    return std::make_tuple(uploaded_ptr, uploaded_offset);
-}
-
 bool OGLBufferCache::Map(std::size_t max_size) {
     bool invalidate;
     std::tie(buffer_ptr, buffer_offset_base, invalidate) =

src/video_core/renderer_opengl/gl_buffer_cache.h

@@ -61,9 +61,6 @@ public:
     /// Uploads from a host memory. Returns host's buffer offset where it's been allocated.
     GLintptr UploadHostMemory(const void* raw_pointer, std::size_t size, std::size_t alignment = 4);
 
-    /// Reserves memory to be used by host's CPU. Returns mapped address and offset.
-    std::tuple<u8*, GLintptr> ReserveMemory(std::size_t size, std::size_t alignment = 4);
-
     bool Map(std::size_t max_size);
     void Unmap();