[clang] Multilib support for libraries with exceptions (PR #75031)

[Michael Platings via cfe-commits]

================
@@ -179,6 +179,12 @@ static void findMultilibsFromYAML(const ToolChain &TC, 
const Driver &D,
   if (!MB)
     return;
   Multilib::flags_list Flags = TC.getMultilibFlags(Args);
+  if (TC.getRTTIMode() == ToolChain::RTTIMode::RM_Disabled) {
+    Flags.push_back("-fno-rtti");
+  }
+  if (TC.getExceptionsMode() == ToolChain::ExceptionsMode::EM_Disabled) {
+    Flags.push_back("-fno-exceptions");
+  }
----------------
mplatings wrote:

This belongs in `getMultilibFlags()`

https://github.com/llvm/llvm-project/pull/75031
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