Split local and global cflags

Native compiler flags are currently applied in approximately:
global cflags
local cflags
local include dirs
global include dirs
global conlyflags
local conlyflags
global cppflags
local cppflags

This means that a flag that is enabled in the global cppflags
cannot be disabled in the local cflags, and an Android.bp author
must know to disable it in the local cppflags.  A better order
would be:
global cflags
global conlyflags
global cppflags
local cflags
local conlyflags
local cppflags
local include dirs
global include dirs

We are mixing both the global and local cflags into a single
variable, and similar for conlyflags and cppflags, which
prevents reordering them.  This CL prepares to reorder them
by splitting the global and local cflags into separate variables.

Bug: 143713277
Test: m native
Change-Id: Ic55a8c3516c331dc5f2af9d00e59ceca9d3e6c15
diff --git a/cc/cflag_artifacts.go b/cc/cflag_artifacts.go
index 9ed3876..b61f2a8 100644
--- a/cc/cflag_artifacts.go
+++ b/cc/cflag_artifacts.go
@@ -147,8 +147,8 @@
 	ctx.VisitAllModules(func(module android.Module) {
 		if ccModule, ok := module.(*Module); ok {
 			if allowedDir(ctx.ModuleDir(ccModule)) {
-				cflags := ccModule.flags.CFlags
-				cppflags := ccModule.flags.CppFlags
+				cflags := ccModule.flags.Local.CFlags
+				cppflags := ccModule.flags.Local.CppFlags
 				module := fmt.Sprintf("%s:%s (%s)",
 					ctx.BlueprintFile(ccModule),
 					ctx.ModuleName(ccModule),