[clang] [clang][modules-driver] Add dependency scan and dependency graph (PR #152770)

[Naveen Seth Hanig via cfe-commits]

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@@ -587,6 +587,24 @@ def remark_found_cxx20_module_usage : Remark<
 def remark_performing_driver_managed_module_build : Remark<
   "performing driver managed module build">,
   InGroup<ModulesDriver>;
+def remark_modules_manifest_not_found : Remark<
+  "standard modules manifest file not found; import of standard library "
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naveen-seth wrote:

Hi sorry, I completely missed this!
Addressed in 223e81cf.
Initially, -nostdlib didn't prevent discovery of the standard modules manifest, but this was fixed in #161110 (which is why I rebased).

https://github.com/llvm/llvm-project/pull/152770