PNaCl: Add ExpandTls pass for expanding out static TLS variables

This replaces each reference to a TLS variable "foo" with the LLVM IR
equivalent of the expression:
  ((struct tls_template *) __nacl_read_tp())->foo

This pass fills out the global variables __tls_template_start,
__tls_template_end etc. which are used by src/untrusted/nacl/tls.c.
These are the symbols that are otherwise defined by a binutils linker
script.

In order to handle the case of TLS variables that occur inside
ConstantExprs, we have a helper pass, ExpandTlsConstantExpr.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=2837
TEST=test/Transforms/NaCl/expand-tls*.ll

Review URL: https://chromiumcodereview.appspot.com/10896042

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