LLVM 3.5 merge: Subzero

LLVM 3.5 merge: Subzero

OwningPtr is now unique_ptr.

Variable's copy ctor is deleted and Variable::asType returns a Variable. That
used to work because of return value optimization and doesn't work anymore
because the implicitly-declared move ctor is getting deleted (because at least
one data member, IceString, isn't trivially copyable). This wouldn't be a
problem in C++14, but it is in C++11, the implicitly declared move ctor
therefore needs to be force-generated by marking it with '= default'.

InstX8632Lockable::dump was declared but never defined, causing a link error because of a missing vtable.

getFileOrSTDIN now uses ErrorOr.

LLVM now uses C++11's std::error_code.

Add missing header for SmallString.

ValueHandle.h changed location.

LLVM_OVERRIDE is now override (and doesn't require virtual).

Add missing header for LLVM_DELETED_FUNCTION.


R= stichnot@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3930
TEST= ???

[JF, 2014-08-28 01:32:38]

This isn't ready to be committed yet: I'll need to pass all tests, and commit
LLVM changes first.

[Jim Stichnoth, 2014-08-28 16:56:23]

Science-dog &&LGTM.

Since asType() explicitly only happens for Variable type, maybe the default move
ctor stuff could only be applied to Variable?

Also, I was never happy using asType(), so I should reevaluate that whole
mechanism.

[JF, 2014-08-29 22:15:28]

A few more fixes. It looks like subzero now builds and links.

InstX8632Lockable::dump was declared but never defined, causing a link error
because of a missing vtable.

getFileOrSTDIN now uses ErrorOr.

LLVM now uses C++11's std::error_code.

Add missing header for SmallString.

ValueHandle.h changed location.

LLVM_OVERRIDE is now override (and doesn't require virtual).

Add missing header for LLVM_DELETED_FUNCTION.

[JF, 2014-09-26 16:52:24]

Closing this CL since Jim generously self-migrated to C++11 with a 95% success
rate. I'll send a separate CL for LLVM's header changes (those are gated on
3.5).