[MS Demangler] Fix some minor formatting bugs.

1) We print __restrict twice on member pointers.  This is fixed
   and relevant tests are re-enabled.

2) Several tests were disabled because of printing slightly
   different output than undname.  These were confirmed to be
   bugs in undname, so we just re-enable the tests.

3) The test for printing reference temporaries is re-enabled.  This
   is a clang mangling extension, so we have some flexibility with
   how we demangle it.  The output currently looks fine, so we just
   re-enable the test with no fixes.

llvm-svn: 339708