Fix -dA flag, it is not a preprocessor flag.

-dA was in the d_group, which is a preprocessor state dumping group.
However -dA is a debug flag to cause a verbose asm.  It was already
implemented to do the same thing as -fverbose-asm, so make it just be an
alias.

llvm-svn: 369926
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 76d3f62..4f475b1 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4080,8 +4080,7 @@
   // toolchains which have the integrated assembler on by default.
   bool IsIntegratedAssemblerDefault = TC.IsIntegratedAssemblerDefault();
   if (Args.hasFlag(options::OPT_fverbose_asm, options::OPT_fno_verbose_asm,
-                   IsIntegratedAssemblerDefault) ||
-      Args.hasArg(options::OPT_dA))
+                   IsIntegratedAssemblerDefault))
     CmdArgs.push_back("-masm-verbose");
 
   if (!TC.useIntegratedAs())