Change usage of naclcall and nacljmp pseudo-instructions to match x86 gas

lib/Target/X86/X86NaClRewritePass.cpp

Index: lib/Target/X86/X86NaClRewritePass.cpp
diff --git a/lib/Target/X86/X86NaClRewritePass.cpp b/lib/Target/X86/X86NaClRewritePass.cpp
index 4ecd55ea8996e74f62f06e0c66236212ecc87388..57d5cd88661b6f98bc494741e936d3cbf5fe7338 100644
--- a/lib/Target/X86/X86NaClRewritePass.cpp
+++ b/lib/Target/X86/X86NaClRewritePass.cpp
@@ -462,8 +462,9 @@ bool X86NaClRewritePass::ApplyControlSFI(MachineBasicBlock &MBB,
           .addOperand(MI.getOperand(0))
           .addReg(FlagUseZeroBasedSandbox ? 0 : X86::R15);
       }
+
       BuildMI(MBB, MBBI, DL, TII->get(X86::NACL_JMP64r))
-        .addReg(RegTarget)
+        .addReg(getX86SubSuperRegister(RegTarget, MVT::i32, false))
         .addReg(FlagUseZeroBasedSandbox ? 0 : X86::R15);
     } else {
       RegTarget = X86::ECX;