[AMDGPU][DOC][NFC] Added links to MI200 documentation

Differential Revision: https://reviews.llvm.org/D121811

Author: dpreobra

llvm/docs/AMDGPUUsage.rst

@@ -319,7 +319,7 @@ Every processor supports every OS ABI (see :ref:`amdgpu-os`) with the following
                                                                                                         Add product
                                                                                                         names.
 
-     **GCN GFX9 (Vega)** [AMD-GCN-GFX900-GFX904-VEGA]_ [AMD-GCN-GFX906-VEGA7NM]_ [AMD-GCN-GFX908-CDNA1]_
+     **GCN GFX9 (Vega)** [AMD-GCN-GFX900-GFX904-VEGA]_ [AMD-GCN-GFX906-VEGA7NM]_ [AMD-GCN-GFX908-CDNA1]_ [AMD-GCN-GFX90A-CDNA2]_
      -----------------------------------------------------------------------------------------------------------------------
      ``gfx900``                  ``amdgcn``   dGPU  - xnack           - Absolute      - *rocm-amdhsa* - Radeon Vega
                                                                         flat          - *pal-amdhsa*    Frontier Edition
@@ -14207,8 +14207,9 @@ in this description.
 For more information about instructions, their semantics and supported
 combinations of operands, refer to one of instruction set architecture manuals
 [AMD-GCN-GFX6]_, [AMD-GCN-GFX7]_, [AMD-GCN-GFX8]_,
-[AMD-GCN-GFX900-GFX904-VEGA]_, [AMD-GCN-GFX906-VEGA7NM]_
-[AMD-GCN-GFX908-CDNA1]_, [AMD-GCN-GFX10-RDNA1]_ and [AMD-GCN-GFX10-RDNA2]_.
+[AMD-GCN-GFX900-GFX904-VEGA]_, [AMD-GCN-GFX906-VEGA7NM]_,
+[AMD-GCN-GFX908-CDNA1]_, [AMD-GCN-GFX90A-CDNA2]_, [AMD-GCN-GFX10-RDNA1]_ and
+[AMD-GCN-GFX10-RDNA2]_.
 
 Operands
 ~~~~~~~~
@@ -14978,6 +14979,7 @@ Additional Documentation
 .. [AMD-GCN-GFX900-GFX904-VEGA] `AMD Vega Instruction Set Architecture <http://developer.amd.com/wordpress/media/2013/12/Vega_Shader_ISA_28July2017.pdf>`__
 .. [AMD-GCN-GFX906-VEGA7NM] `AMD Vega 7nm Instruction Set Architecture <https://gpuopen.com/wp-content/uploads/2019/11/Vega_7nm_Shader_ISA_26November2019.pdf>`__
 .. [AMD-GCN-GFX908-CDNA1] `AMD Instinct MI100 Instruction Set Architecture <https://developer.amd.com/wp-content/resources/CDNA1_Shader_ISA_14December2020.pdf>`__
+.. [AMD-GCN-GFX90A-CDNA2] `AMD Instinct MI200 Instruction Set Architecture <https://developer.amd.com/wp-content/resources/CDNA2_Shader_ISA_4February2022.pdf>`__
 .. [AMD-GCN-GFX10-RDNA1] `AMD RDNA 1.0 Instruction Set Architecture <https://gpuopen.com/wp-content/uploads/2019/08/RDNA_Shader_ISA_5August2019.pdf>`__
 .. [AMD-GCN-GFX10-RDNA2] `AMD RDNA 2 Instruction Set Architecture <https://developer.amd.com/wp-content/resources/RDNA2_Shader_ISA_November2020.pdf>`__
 .. [AMD-RADEON-HD-2000-3000] `AMD R6xx shader ISA <http://developer.amd.com/wordpress/media/2012/10/R600_Instruction_Set_Architecture.pdf>`__