Improve state tracking when the depth and/or stencil attachments are
invalidated.  Since no draw-time tracking is done, we use the number
of command-buffer commands to determine when an attachment is drawn
to.  That allows all cases to be handled for store ops.  Still need to
handle mContentDefined at endRP time (we have the data, just not the
plumbing).

Test: angle_white_box_tests --gtest_filter=VulkanPerformanceCounterTest.*Invalidate*/*
Test: angle_deqp_gles3_tests --gtest_filter=dEQP.GLES3/functional_fbo_invalidate_* --use-angle=vulkan
Bug: b/167276207
Change-Id: Iae10857dbb4d43b934c51ad7e400b71ae0db4f55
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2378670Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Charlie Lao <cclao@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>