PNaCl: Add a pass to expand out Clang's use of registers of struct type

Clang's implementation of C++ method pointers generates IR that uses
LLVM registers with struct type -- specifically, loads and stores of
struct values, and extractvalue instructions.  See
lib/CodeGen/ItaniumCXXABI.cpp in Clang.  Add a pass, ExpandStructRegs,
which expands out those uses.

Factor out a function from ExpandArithWithOverflow so that the two
passes can share some code.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3343
TEST=*.ll tests + trybots + GCC torture tests

Review URL: https://codereview.chromium.org/15692014

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