[mips] Pass nan2008 info to the back-end.

Summary: The initial support for NaN2008 was added to the back-end in r206396.

Reviewers: atanasyan

Reviewed By: atanasyan

Differential Revision: http://reviews.llvm.org/D3448

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208220 91177308-0d34-0410-b5e6-96231b3b80d8
Remove "CH_ECK" line (which is ignored) from test after r154191.

r154191 switched to atexit() instead of global destructors, so the intent
was probably to check for _GLOBAL__D_a _not_ being in the output. There already
is a line for _ZN3barD1Ev further up, so just remove the CH_ECK line referring
to that.

The only circumstance in which clang emits _GLOBAL__D_a destructor symbols is
for -fapple-kext, and that is tested by test/CodeGenCXX/cxx-apple-kext.cpp.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208222 91177308-0d34-0410-b5e6-96231b3b80d8