[dynarmic] add tuple constructor to Matcher

GetName, GetNameArm, and other similar functions introduced lately initialize
a `std::vector<std::pair>` from a macro-expanded brace list:

    std::vector<std::pair<std::string_view, Matcher<V>>> list = {
        { name, DYNARMIC_DECODER_GET_MATCHER(...) },
        ...
    };

... but DYNARMIC_DECODER_GET_MATCHER returns `std::tuple<u32, u32>`, which cannot
initialize Matcher<V> on my side:

    error: could not convert ‘{{"VMLA", ...}’
    from ‘<brace-enclosed initializer list>’ to ‘...’

This commit adds an explicit tuple constructor so it compiles.

src/dynarmic/src/dynarmic/frontend/decoder/matcher.h

@@ -9,6 +9,7 @@
 #pragma once
 
 #include <functional>
+#include <tuple>
 
 #include "common/assert.h"
 
@@ -31,6 +32,10 @@ public:
         , expected{expected}
     {}
 
+    constexpr Matcher(std::tuple<T, T> t) noexcept
+        : Matcher(std::get<0>(t), std::get<1>(t))
+    {}
+
     /// @brief Gets the mask for this instruction.
     constexpr inline T GetMask() const noexcept {
         return mask;