Extend the IL for selecting TLS models (PR9788)

This allows the user/front-end to specify a model that is better
than what LLVM would choose by default. For example, a variable
might be declared as

  @x = thread_local(initialexec) global i32 42

if it will not be used in a shared library that is dlopen'ed.

If the specified model isn't supported by the target, or if LLVM can
make a better choice, a different model may be used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159077 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AsmParser/LLParser.h b/lib/AsmParser/LLParser.h
index dda8808..257c726 100644
--- a/lib/AsmParser/LLParser.h
+++ b/lib/AsmParser/LLParser.h
@@ -171,6 +171,9 @@
       Loc = Lex.getLoc();
       return ParseUInt32(Val);
     }
+
+    bool ParseTLSModel(GlobalVariable::ThreadLocalMode &TLM);
+    bool ParseOptionalThreadLocal(GlobalVariable::ThreadLocalMode &TLM);
     bool ParseOptionalAddrSpace(unsigned &AddrSpace);
     bool ParseOptionalAttrs(Attributes &Attrs, unsigned AttrKind);
     bool ParseOptionalLinkage(unsigned &Linkage, bool &HasLinkage);