[C++20] [Modules] Chose BMI from for module m with the last

-fmodule-file=<module-name>= option

Currently if we have multiple `-fmodule-file=<module-name>=<BMI-path>`
flags for the same `<module-name>`, we will pick the BMI-path from the
first flag. And this is inconsistent with what users generally expect.
e.g, we might expect the latter flags can override the former ones.

This patch changes the behavior to match user's expectation.

Author: ChuanqiXu9

clang/lib/Frontend/CompilerInvocation.cpp

@@ -3163,8 +3163,8 @@ static bool ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
     StringRef Val = A->getValue();
     if (Val.contains('=')) {
       auto Split = Val.split('=');
-      Opts.PrebuiltModuleFiles.insert(
-          {std::string(Split.first), std::string(Split.second)});
+      Opts.PrebuiltModuleFiles.insert_or_assign(
+          std::string(Split.first), std::string(Split.second));
     }
   }
   for (const auto *A : Args.filtered(OPT_fprebuilt_module_path))

clang/test/Modules/duplicated-module-file-eq-module-name.cppm

@@ -0,0 +1,21 @@
+// Tests that we will pick the last `-fmodule-file=<module-name>=<path>` flag
+// for <module-name>.
+
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: cd %t
+//
+// RUN: %clang_cc1 -std=c++20 %t/a.cppm -emit-module-interface -o %t/a.pcm
+// RUN: %clang_cc1 -std=c++20 %t/u.cpp -fmodule-file=a=%t/unexist.pcm \
+// RUN:      -fmodule-file=a=%t/a.pcm -verify -fsyntax-only
+
+//--- a.cppm
+export module a;
+export int a();
+
+//--- u.cpp
+// expected-no-diagnostics
+import a;
+int u() {
+    return a();
+}