[Fix, Test] (MG_Backend/DirectVulkan, MG_Util, MG_Test): VkProgramObject move dropped stageSpirvDigests - a robin-hood swap would pair one program's modules with another's digests; sanity tests assert key identity, not iteration counts

MobileGL/MG_State/GLState/BufferState/BufferState.cpp

@@ -68,7 +68,7 @@ namespace MobileGL::MG_State::GLState {
                     }
                 }
                 // Erase through the iterator already in hand: erase(key) would repeat the
-                // find() from line 55, and the successor scan that once made key-based
+                // find() above, and the successor scan that once made key-based
                 // erase the cheaper of the two no longer happens here - erase(iterator)
                 // hands back an unconverted proxy, and the scan is what converting it
                 // would cost. The unbind loops above touch only the binding arrays, so