Map render pass clear masks to OpenGL

docs/modernization/build-inventory.md

@@ -200,7 +200,8 @@ Known local toolchain state:
   render-target texture parameters, texture/renderbuffer targets, depth format,
   framebuffer targets, binding queries, attachment points, and completion
   status used by `RTT::create` and framebuffer bind/restore paths, plus RTT
-  clear color/depth masks and color-write-mask query tokens. `RTT` no longer
+  clear color/depth masks, renderer API render-pass color/depth/stencil
+  clear-mask mapping, and color-write-mask query tokens. `RTT` no longer
   spells GL enum names directly. It also
   validates renderer API primitive-topology to OpenGL draw-mode mapping, Shape
   index-type, fill/stroke primitive-mode, buffer target, static upload usage,