Use MCSubtargetInfo::getAllProcessorFeatures()

This method is now available in upstream LLVM \o/

.gitmodules

@@ -32,8 +32,8 @@
 	shallow = true
 [submodule "src/llvm-project"]
 	path = src/llvm-project
-	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/17.0-2023-12-14
+	url = https://github.com/nikic/llvm-project.git
+	branch = rust-llvm-18
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -368,10 +368,10 @@ extern "C" void LLVMRustPrintTargetCPUs(LLVMTargetMachineRef TM,
 }
 
 extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
-#ifdef LLVM_RUSTLLVM
+#if LLVM_VERSION_GE(18, 0)
   const TargetMachine *Target = unwrap(TM);
   const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
-  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
+  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getAllProcessorFeatures();
   return FeatTable.size();
 #else
   return 0;
@@ -380,10 +380,10 @@ extern "C" size_t LLVMRustGetTargetFeaturesCount(LLVMTargetMachineRef TM) {
 
 extern "C" void LLVMRustGetTargetFeature(LLVMTargetMachineRef TM, size_t Index,
                                          const char** Feature, const char** Desc) {
-#ifdef LLVM_RUSTLLVM
+#if LLVM_VERSION_GE(18, 0)
   const TargetMachine *Target = unwrap(TM);
   const MCSubtargetInfo *MCInfo = Target->getMCSubtargetInfo();
-  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getFeatureTable();
+  const ArrayRef<SubtargetFeatureKV> FeatTable = MCInfo->getAllProcessorFeatures();
   const SubtargetFeatureKV Feat = FeatTable[Index];
   *Feature = Feat.Key;
   *Desc = Feat.Desc;