[clang] [clang][DependencyScanning] Reset options generated for named module compilations. (PR #161486)

[Naveen Seth Hanig via cfe-commits]

naveen-seth wrote:

For additional context:
Using the DOT dependency graph remark introduced in #152770, this patch changes the dependency scan result for the new regression test:

### Before this patch:
<p align="center">
  <img src="https://github.com/user-attachments/assets/c2d5ad60-de15-47dc-b62e-be1704f3032c" alt="graph-before-fix"/>
</p>

Because the driver-generated -cc1 command lines for C++ named module inputs affect the canonical module build command, the Clang module _root_ ends up with a different context hash for each import of a named module input.

### After this patch:
<p align="center">
  <img src="https://github.com/user-attachments/assets/4135d3e8-5726-4788-8d47-26a6330d8eca" alt="graph-after-fix"/>
</p>

https://github.com/llvm/llvm-project/pull/161486