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

`MCSymbolRefExpr` variant kind for TLSCALL is prefixed with 
_ARM_ since this is how it was originally implemented.
The X86_64 version is exactly the same so there's no reason
to create a new variant, we can just rename the existing
one to be machine-independent.
This generalization is the first step to implement support
for GNU2 TLS dialect in MC.

Differential Revision:  http://reviews.llvm.org/D18160

llvm-svn: 263515
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
index 8901de5..a0402d9 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -458,7 +458,7 @@
     // Offset by 8 just as above.
     if (const MCSymbolRefExpr *SRE =
             dyn_cast<MCSymbolRefExpr>(Fixup.getValue()))
-      if (SRE->getKind() == MCSymbolRefExpr::VK_ARM_TLSCALL)
+      if (SRE->getKind() == MCSymbolRefExpr::VK_TLSCALL)
         return 0;
     return 0xffffff & ((Value - 8) >> 2);
   case ARM::fixup_t2_uncondbranch: {
@@ -536,7 +536,7 @@
     uint32_t offset = (Value - 2) >> 2;
     if (const MCSymbolRefExpr *SRE =
             dyn_cast<MCSymbolRefExpr>(Fixup.getValue()))
-      if (SRE->getKind() == MCSymbolRefExpr::VK_ARM_TLSCALL)
+      if (SRE->getKind() == MCSymbolRefExpr::VK_TLSCALL)
         offset = 0;
     uint32_t signBit = (offset & 0x400000) >> 22;
     uint32_t I1Bit = (offset & 0x200000) >> 21;