[mips] The decision to use MO_GOT_PAGE and MO_GOT_OFST depends on the ABI being N32 or N64 not the arch being MIPS64

Summary: No functional change (in supported use cases)

Reviewers: matheusalmeida

Reviewed By: matheusalmeida

Differential Revision: http://llvm-reviews.chandlerc.com/D3177

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204805 91177308-0d34-0410-b5e6-96231b3b80d8
Change @llvm.clear_cache default to call rt-lib

After some discussion on IRC, emitting a call to the library function seems
like a better default, since it will move from a compiler internal error to
a linker error, that the user can work around until LLVM is fixed.

I'm also adding a note on the responsibility of the user to confirm that
the cache was cleared on platforms where nothing is done.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204806 91177308-0d34-0410-b5e6-96231b3b80d8
[mips] Hoist common functionality into a new function.
    
Given that we support multiple directives that enable a particular feature
(e.g. '.set mips16'), it's best to hoist that code into a new function
so that we don't repeat the same pattern w.r.t parsing and handling error cases.

No functional changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204811 91177308-0d34-0410-b5e6-96231b3b80d8
Clarify llvm.clear_cache description.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204812 91177308-0d34-0410-b5e6-96231b3b80d8
ARM: add intrinsics for the v8 ldaex/stlex

We've already got versions without the barriers, so this just adds IR-level
support for generating the new v8 ones.

rdar://problem/16227836

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204813 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64_BE function argument passing for ARM ABI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204814 91177308-0d34-0410-b5e6-96231b3b80d8
[mips] Add support to '.set mips64r2'.

The '.set mips64r2' directive enables the feature Mips:FeatureMips64r2
from assembly. Note that it doesn't modify the ELF header as opposed
to the use of -mips64r2 from the command-line. The reason for this
is that we want to be as compatible as possible with existing assemblers
like GAS.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204815 91177308-0d34-0410-b5e6-96231b3b80d8