[clang] [llvm] [AArch64TargetParser]Fix reconstructFromParsedFeatures ignoring negative features (PR #142236)

[Matthias Braun via cfe-commits]

================
@@ -1831,6 +1831,22 @@ TEST_P(AArch64ExtensionDependenciesBaseCPUTestFixture,
   }
 }
 
+TEST(TargetParserTest, testAArch64ReconstructFromParsedFeatures) {
+  AArch64::ExtensionSet Extensions;
+  std::vector<std::string> FeatureOptions = {
+      "-sve2", "-Baz", "+sve", "+FooBar", "+sve2", "+neon", "-sve",
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MatzeB wrote:

This line very much looked like it was meant to handle it: 
https://github.com/llvm/llvm-project/blob/main/llvm/lib/TargetParser/AArch64TargetParser.cpp#L368

https://github.com/llvm/llvm-project/pull/142236
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