rename -parse-ast-view to -ast-view

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42853 91177308-0d34-0410-b5e6-96231b3b80d8

Driver/clang.cpp

@@ -87,7 +87,7 @@ ProgAction(llvm::cl::desc("Choose output type:"), llvm::cl::ZeroOrMore,
                         "Build ASTs and then pretty-print them"),
              clEnumValN(ASTDump, "ast-dump",
                         "Build ASTs and then debug dump them"),
-             clEnumValN(ASTView, "parse-ast-view",
+             clEnumValN(ASTView, "ast-view",
                         "Build ASTs and view them with GraphViz."),
              clEnumValN(ParseCFGDump, "dump-cfg",
                         "Run parser, then build and print CFGs."),