Remove a use of OPT_m_Joined.

This patch turns the -mv* hexagon options into aliases. We should really produce
errors for invalid versions in the driver, but this patch preserves the old
behavior for now.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191298 91177308-0d34-0410-b5e6-96231b3b80d8
Use a valid option (-msse) for testing QA_OVERRIDE_GCC3_OPTIONS.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191300 91177308-0d34-0410-b5e6-96231b3b80d8
Revert my patch in r191155 to allow forward
class/protocol decls in @implementation and
fixup modern rewriter to handle that.
// rdar://15066233


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191311 91177308-0d34-0410-b5e6-96231b3b80d8
clang-cl: pass /nologo when falling back to cl.exe

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191316 91177308-0d34-0410-b5e6-96231b3b80d8
clang-cl: fix passing optimization level to cl.exe in /fallback mode

We were previously mostly passing it through, but -O0 and -O3 are not valid
options to cl.exe.

We should translate -O0 to /Od and -O3 to /Ox. -O{1,2,s} get passed through.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191323 91177308-0d34-0410-b5e6-96231b3b80d8