[MC] Rename TLSDESC as it's not ARM specific.

Similarly to what was done for TLSCALL in r263515.

llvm-svn: 263564
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
index 18d2aa6..d618df4 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMELFObjectWriter.cpp
@@ -216,7 +216,7 @@
       case MCSymbolRefExpr::VK_TLSCALL:
         Type = ELF::R_ARM_TLS_CALL;
         break;
-      case MCSymbolRefExpr::VK_ARM_TLSDESC:
+      case MCSymbolRefExpr::VK_TLSDESC:
         Type = ELF::R_ARM_TLS_GOTDESC;
         break;
       case MCSymbolRefExpr::VK_ARM_TLSDESCSEQ: