optimize i8 and i16 tls values.

llvm-svn: 66725
diff --git a/llvm/test/CodeGen/X86/tls12.ll b/llvm/test/CodeGen/X86/tls12.ll
new file mode 100644
index 0000000..c6f766d
--- /dev/null
+++ b/llvm/test/CodeGen/X86/tls12.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | llc -march=x86 -mtriple=i386-linux-gnu > %t
+; RUN: grep {movzbl	%gs:i@NTPOFF, %eax} %t
+
+@i = thread_local global i8 15
+
+define i8 @f() {
+entry:
+	%tmp1 = load i8* @i
+	ret i8 %tmp1
+}