[PATCH] [ms-cxxabi] Fix a number of bugs in the mangler.

[Reid Kleckner]

  LGTM with the rtti bit split out


================
Comment at: test/CodeGenCXX/mangle-ms-arg-qualifiers.cpp:105
@@ +104,3 @@
+
+void foo_qay04cbh(const int x[5][5]) {}
+// CHECK: "\01?foo_qay04cbh@@YAXQAY04$$CBH at Z"
----------------
MQ_Result is used to mangle the return value, right?  Can we do just one test for a qualified return value?


http://llvm-reviews.chandlerc.com/D709