[clang] [llvm] [DXIL] Remove incompatible metadata types when preparing DXIL. (PR #136386)

[Farzon Lotfi via cfe-commits]

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@@ -189,6 +201,9 @@ class DXILPrepareModule : public ModulePass {
       for (auto &BB : F) {
         IRBuilder<> Builder(&BB);
         for (auto &I : make_early_inc_range(BB)) {
+
+          I.dropUnknownNonDebugMetadata(DXILCompatibleMDs);
+
           if (I.getOpcode() == Instruction::FNeg) {
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farzonl wrote:

DXILPrepare has a bunch of overlap with the legalization pass. Seems like MetaData might not be able to move because legalization is a function level pass and this is a module level one, but at a minimum it seems like FNeg -> FSub should move.

https://github.com/llvm/llvm-project/pull/136386