docs: add release notes for 21.3.3

docs/relnotes/21.3.3.rst

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+Mesa 21.3.3 Release Notes / 2021-12-29
+======================================
+
+Mesa 21.3.3 is a bug fix release which fixes bugs found since the 21.3.2 release.
+
+Mesa 21.3.3 implements the OpenGL 4.6 API, but the version reported by
+glGetString(GL_VERSION) or glGetIntegerv(GL_MAJOR_VERSION) /
+glGetIntegerv(GL_MINOR_VERSION) depends on the particular driver being used.
+Some drivers don't support all the features required in OpenGL 4.6. OpenGL
+4.6 is **only** available if requested at context creation.
+Compatibility contexts may report a lower version depending on each driver.
+
+Mesa 21.3.3 implements the Vulkan 1.2 API, but the version reported by
+the apiVersion property of the VkPhysicalDeviceProperties struct
+depends on the particular driver being used.
+
+SHA256 checksum
+---------------
+
+::
+
+    TBD.
+
+
+New features
+------------
+
+- None
+
+
+Bug fixes
+---------
+
+- Assassin's Creed Syndicate crashes with Mesa 21.3.0+ ACO
+- [21.3 regression] swr: Build failure with MSVC
+- anv: dEQP-VK.graphicsfuzz.spv-stable-pillars-volatile-nontemporal-store fails
+
+
+Changes
+-------
+
+Alyssa Rosenzweig (2):
+
+- pan/indirect_draw: Don't upload garbage UBO
+- panfrost: Fix Secondary Shader field
+
+Bas Nieuwenhuizen (2):
+
+- radv: Use correct buffer size for query pool result copies.
+- radv: Skip wait timeline ioctl with 0 handles.
+
+Daniel Schürmann (2):
+
+- aco/optimizer: fix fneg modifier propagation on VOP3P
+- aco/ra: fix get_reg_for_operand() in case of stride mismatches
+
+Emma Anholt (7):
+
+- r300: Fix mis-optimization turning -1 - x into 1 - x.
+- r300: Move the instruction filter for r500_transform_IF() to the top.
+- r300: Ensure that immediates have matching negate flags too.
+- r300: Also consider ALU condition modifiers for loop DCE.
+- r300: Disable loop unrolling on r500.
+- r300/vs: Allocate temps we see a use as a source, too.
+- r300/vs: Fix flow control processing just after an endloop.
+
+Eric Engestrom (2):
+
+- .pick_status.json: Update to 4942e108909bbe0f53ec5fd52a3c7ae14c60abe6
+- .pick_status.json: Mark d49d092259829ad9e33d0d9fc8eef9759d9fe56e as denominated
+
+Francisco Jerez (1):
+
+- intel/fs: Add physical fall-through CFG edge for unconditional BREAK instruction.
+
+Jason Ekstrand (1):
+
+- vulkan/log: Don't assert on non-client-visible objects
+
+Jesse Natalie (1):
+
+- microsoft/compiler: Implement inot
+
+Liviu Prodea (1):
+
+- swr: Fix MSVC build
+
+Rob Clark (2):
+
+- freedreno/ir3: Handle instr->address when cloning
+- freedreno/computerator: Fix @buf header
+
+Samuel Pitoiset (1):
+
+- radv: re-apply "Do not access set layout during vkCmdBindDescriptorSets."
+
+Tapani Pälli (1):
+
+- glsl: fix invariant qualifer usage and matching rule for GLSL 4.20
+
+Timur Kristóf (2):
+
+- aco/optimizer_postRA: Fix combining DPP into VALU.
+- aco/optimizer_postRA: Fix applying VCC to branches.
+
+Vinson Lee (1):
+
+- panfrost: Avoid double unlock.