[Hexagon] Define 87 and 89 ISA and processor versions in ELF flags

These versions are not supported by upstream LLVM but are needed to add
such support in the eld linker.

Author: quic-akaryaki

llvm/include/llvm/BinaryFormat/ELF.h

@@ -637,6 +637,8 @@ enum {
   EF_HEXAGON_ISA_V81 = 0x00000081,  // Hexagon V81 ISA
   EF_HEXAGON_ISA_V83 = 0x00000083,  // Hexagon V83 ISA
   EF_HEXAGON_ISA_V85 = 0x00000085,  // Hexagon V85 ISA
+  EF_HEXAGON_ISA_V87 = 0x00000087,  // Hexagon V87 ISA
+  EF_HEXAGON_ISA_V89 = 0x00000089,  // Hexagon V89 ISA
   EF_HEXAGON_ISA = 0x000003ff,      // Hexagon V.. ISA
 
   // Tiny core flag, bit[15]
@@ -668,6 +670,8 @@ enum {
   EF_HEXAGON_MACH_V81 = EF_HEXAGON_ISA_V81,      // Hexagon V81
   EF_HEXAGON_MACH_V83 = EF_HEXAGON_ISA_V83,      // Hexagon V83
   EF_HEXAGON_MACH_V85 = EF_HEXAGON_ISA_V85,      // Hexagon V85
+  EF_HEXAGON_MACH_V87 = EF_HEXAGON_ISA_V87,      // Hexagon V87
+  EF_HEXAGON_MACH_V89 = EF_HEXAGON_ISA_V89,      // Hexagon V89
 
   EF_HEXAGON_MACH = 0x0000ffff, // Hexagon V..
 };