Merge pull request #5683 from MarcZX100/codex/rosetta-scalar-compare-5642

fix(relinker): isolate Rosetta scalar compare hazards

core/relinker/codegen/include/codegen/x86/Amd64OnlySubstitutionTable.hpp

@@ -42,6 +42,7 @@ inline constexpr Entry kRdseed = {"RDSEED", nullptr, 0};
 inline constexpr Entry kRdpid = {"RDPID", nullptr, 0};
 inline constexpr Entry kClwb = {"CLWB", nullptr, 0};
 inline constexpr Entry kWideStore = {"256-bit store", nullptr, 0};
+inline constexpr Entry kScalarCompare = {"scalar compare", nullptr, 0};
 inline constexpr Entry kExtrq = {"EXTRQ", nullptr, 0};
 inline constexpr Entry kInsertq = {"INSERTQ", nullptr, 0};
 inline constexpr Entry kExtrqRegisterForm = {"EXTRQ register form", nullptr, 0};

core/relinker/codegen/include/codegen/x86/ScalarCompareOperands.hpp

@@ -0,0 +1,19 @@
+#ifndef CODEGEN_X86_SCALARCOMPAREOPERANDS_HPP
+#define CODEGEN_X86_SCALARCOMPAREOPERANDS_HPP
+
+#include <cstddef>
+#include <cstdint>
+#include <optional>
+
+namespace Codegen {
+
+struct ScalarCompareOperands {
+    std::optional<std::size_t> RipDisplacementOffset;
+    std::int64_t RipTarget = 0;
+};
+
+[[nodiscard]] std::optional<ScalarCompareOperands> DecodeScalarCompare(const std::uint8_t* data, std::size_t length);
+
+}
+
+#endif