AMDGPU: Reserve 0x048, 0x049, 0x04a MACHs

Differential Revision: https://reviews.llvm.org/D149856

Author: kzhuravl

llvm/docs/AMDGPUUsage.rst

@@ -1321,6 +1321,9 @@ The AMDGPU backend uses the following ELF header:
      ``EF_AMDGPU_MACH_AMDGCN_GFX1036``    0x045      ``gfx1036``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1101``    0x046      ``gfx1101``
      ``EF_AMDGPU_MACH_AMDGCN_GFX1102``    0x047      ``gfx1102``
+     *reserved*                           0x048      Reserved.
+     *reserved*                           0x049      Reserved.
+     *reserved*                           0x04a      Reserved.
      ==================================== ========== =============================
 
 Sections

llvm/include/llvm/BinaryFormat/ELF.h

@@ -778,10 +778,13 @@ enum : unsigned {
   EF_AMDGPU_MACH_AMDGCN_GFX1036       = 0x045,
   EF_AMDGPU_MACH_AMDGCN_GFX1101       = 0x046,
   EF_AMDGPU_MACH_AMDGCN_GFX1102       = 0x047,
+  EF_AMDGPU_MACH_AMDGCN_RESERVED_0X48 = 0x048,
+  EF_AMDGPU_MACH_AMDGCN_RESERVED_0X49 = 0x049,
+  EF_AMDGPU_MACH_AMDGCN_RESERVED_0X4A = 0x04a,
 
   // First/last AMDGCN-based processors.
   EF_AMDGPU_MACH_AMDGCN_FIRST = EF_AMDGPU_MACH_AMDGCN_GFX600,
-  EF_AMDGPU_MACH_AMDGCN_LAST = EF_AMDGPU_MACH_AMDGCN_GFX1102,
+  EF_AMDGPU_MACH_AMDGCN_LAST = EF_AMDGPU_MACH_AMDGCN_RESERVED_0X4A,
 
   // Indicates if the "xnack" target feature is enabled for all code contained
   // in the object.