AMDGPU/ELF: Sort MACHs by value and add missing reserved MACHs

  - Sort MACHs by its value
  - Add missing reserved MACHs
    - EF_AMDGPU_MACH_AMDGCN_RESERVED_0X3D
    - EF_AMDGPU_MACH_AMDGCN_RESERVED_0X3E

Differential Revision: https://reviews.llvm.org/D97010

Author: kzhuravl

llvm/docs/AMDGPUUsage.rst

@@ -1131,7 +1131,6 @@ The AMDGPU backend uses the following ELF header:
      ``EF_AMDGPU_MACH_AMDGCN_GFX906``     0x02f      ``gfx906``
      ``EF_AMDGPU_MACH_AMDGCN_GFX908``     0x030      ``gfx908``
      ``EF_AMDGPU_MACH_AMDGCN_GFX909``     0x031      ``gfx909``
-     ``EF_AMDGPU_MACH_AMDGCN_GFX90A``     0x03f      ``gfx90a``
      ``EF_AMDGPU_MACH_AMDGCN_GFX90C``     0x032      ``gfx90c``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1010``    0x033      ``gfx1010``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1011``    0x034      ``gfx1011``
@@ -1143,6 +1142,9 @@ The AMDGPU backend uses the following ELF header:
      ``EF_AMDGPU_MACH_AMDGCN_GFX602``     0x03a      ``gfx602``
      ``EF_AMDGPU_MACH_AMDGCN_GFX705``     0x03b      ``gfx705``
      ``EF_AMDGPU_MACH_AMDGCN_GFX805``     0x03c      ``gfx805``
+     *reserved*                           0x03d      Reserved.
+     *reserved*                           0x03e      Reserved.
+     ``EF_AMDGPU_MACH_AMDGCN_GFX90A``     0x03f      ``gfx90a``
      ==================================== ========== =============================
 
 Sections

llvm/include/llvm/BinaryFormat/ELF.h

@@ -719,7 +719,6 @@ enum : unsigned {
   EF_AMDGPU_MACH_AMDGCN_GFX906        = 0x02f,
   EF_AMDGPU_MACH_AMDGCN_GFX908        = 0x030,
   EF_AMDGPU_MACH_AMDGCN_GFX909        = 0x031,
-  EF_AMDGPU_MACH_AMDGCN_GFX90A        = 0x03f,
   EF_AMDGPU_MACH_AMDGCN_GFX90C        = 0x032,
   EF_AMDGPU_MACH_AMDGCN_GFX1010       = 0x033,
   EF_AMDGPU_MACH_AMDGCN_GFX1011       = 0x034,
@@ -731,6 +730,9 @@ enum : unsigned {
   EF_AMDGPU_MACH_AMDGCN_GFX602        = 0x03a,
   EF_AMDGPU_MACH_AMDGCN_GFX705        = 0x03b,
   EF_AMDGPU_MACH_AMDGCN_GFX805        = 0x03c,
+  EF_AMDGPU_MACH_AMDGCN_RESERVED_0X3D = 0x03d,
+  EF_AMDGPU_MACH_AMDGCN_RESERVED_0X3E = 0x03e,
+  EF_AMDGPU_MACH_AMDGCN_GFX90A        = 0x03f,
 
   // First/last AMDGCN-based processors.
   EF_AMDGPU_MACH_AMDGCN_FIRST = EF_AMDGPU_MACH_AMDGCN_GFX600,