[PATCH] [X86] Don't try to generate direct calls to TLS globals

[Rafael Ávila de Espíndola]

LGTM with a nit.


================
Comment at: test/CodeGen/X86/pr22103.ll:12
@@ +11,3 @@
+define void @_Z1fv() {
+; CHECK-NOT: callq *$a
+entry:
----------------
Please check what we actually generate.

http://reviews.llvm.org/D6862

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