PNaCl: Extend ExpandMulWithOverflow pass to handle uadd.with.overflow too

It turned out that umul.with.overflow wasn't the only *.with.overflow
intrinsic usage introduced by Clang.

I knew that Clang's CGExprCXX.cpp generates umul.with.overflow for an
overflow check for C++'s "new Foo[]".  The same code for handling "new
Foo[]" also generates uadd.with.overflow in some cases.  This happens
if class Foo has a destructor or a delete[] operator that takes a size
argument.  In those cases, the C++ ABI adds a "cookie" to the
allocation which contains the array's size.

Rename the pass to "ExpandArithWithOverflow" and rename files
accordingly.

Also enable the pass.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3434
TEST=*.ll tests + trybots + GCC torture tests

Review URL: https://codereview.chromium.org/15688011

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