[frontend] Add support for disabling the "inline" keyword using

-fno-inline-functions.

This behaves much like -fno-inline in gcc, but based on a discussion with 
Daniel it was decided that -fno-inline-functions should subsume -fno-inline.
Please speak up if you object.  The -fno-inline flag remains ignored.
Final part of rdar://10972766

llvm-svn: 152754

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1165,8 +1165,9 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
   Opts.Inlining = (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
     : CodeGenOptions::OnlyAlwaysInlining;
   // -fno-inline-functions overrides OptimizationLevel > 1.
-  Opts.Inlining = Args.hasArg(OPT_fno_inline_functions) ? 
-    CodeGenOptions::OnlyAlwaysInlining : Opts.Inlining;
+  Opts.NoInline = Args.hasArg(OPT_fno_inline_functions);
+  Opts.Inlining = Opts.NoInline ? CodeGenOptions::OnlyAlwaysInlining :
+    Opts.Inlining;
 
   Opts.DebugInfo = Args.hasArg(OPT_g);
   Opts.LimitDebugInfo = !Args.hasArg(OPT_fno_limit_debug_info)