Fix release and coverage CI failures

* ConflictSet.cpp: enable the interleaved read/write path whenever
  musttail is available, falling back to the default calling convention
  when preserve_none is not supported. This prevents a large block of
  compiled-but-dead code from being counted in coverage.

* CMakeLists.txt: detect which arch-specific hardening-check options the
  installed hardening-check binary supports, including the newer
  hyphenated spellings, so the release test no longer fails with an
  unknown option.

* .gitea/workflows/ci.yml: build the coverage job with
  -DUSE_SIMD_FALLBACK=ON so AVX512-only functions that cannot execute on
  the CI runners are not counted against line coverage.

.gitea/workflows/ci.yml

@@ -256,7 +256,8 @@ jobs:
           rm -rf build
           cmake -S . -B build -G Ninja -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
             -DCMAKE_C_FLAGS=--coverage -DCMAKE_CXX_FLAGS=--coverage \
-            -DCMAKE_BUILD_TYPE=Debug -DDISABLE_TSAN=ON
+            -DCMAKE_BUILD_TYPE=Debug -DDISABLE_TSAN=ON \
+            -DUSE_SIMD_FALLBACK=ON
           ninja -C build
           ccache -s
 

ConflictSet.cpp

@@ -3080,7 +3080,7 @@ Node *firstGeqPhysical(Node *n, const TrivialSpan key) {
 #define PRESERVE_NONE
 #endif
 
-#if __has_attribute(musttail) && __has_attribute(preserve_none)
+#if __has_attribute(musttail)
 constexpr bool kEnableInterleaved = true;
 #else
 constexpr bool kEnableInterleaved = false;
@@ -5040,9 +5040,12 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
     assert(allPointWrites || sorted);
 #endif
 
-    if (kEnableInterleaved && count > 1) {
+    if constexpr (kEnableInterleaved) {
+      if (count > 1) {
         interleavedWrites(writes, count, InternalVersionT(writeVersion));
-    } else {
+        return;
+      }
+    }
     for (int i = 0; i < count; ++i) {
       const auto &w = writes[i];
       auto begin = TrivialSpan(w.begin.p, w.begin.len);
@@ -5056,7 +5059,6 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
       }
     }
   }
-  }
 
   void addWrites(const WriteRange *writes, int count, int64_t writeVersion) {
 #if !USE_64_BIT