Update src/common/assert.h

NINJA REPORTS THIS SHIT ALMOST EVERY STEP!
The reason, any mention to UNIMPLEMENTED() macro reaches this point where a constant expression (macro argument) is not declared so.
Since it's an unimplemented() feature assert call, i`ve just made it non constant. No charges.

[161/863] Building CXX object src\hid_core\CMakeFiles\hid_core.dir\frontend\input_interpreter.cpp.obj
D:\dev\eden\src\.\core/hle/kernel/k_auto_object.h(100): warning C4127: conditional expression is constant
D:\dev\eden\src\.\core/hle/kernel/k_auto_object.h(100): note: consider using 'if constexpr' statement instead
D:\dev\eden\src\.\core/hle/kernel/k_memory_manager.h(246): warning C4127: conditional expression is constant
D:\dev\eden\src\.\core/hle/kernel/k_memory_manager.h(246): note: consider using 'if constexpr' statement instead

Signed-off-by: xbzk <xbzk@eden-emu.dev>

src/common/assert.h

@@ -25,7 +25,8 @@ void AssertFailSoftImpl();
 
 #define ASSERT_MSG(_a_, ...)                                                                       \
     ([&]() YUZU_NO_INLINE {                                                                         \
-        if (!(_a_)) [[unlikely]] {                                                                 \
+        auto&& assert_condition = (_a_);                                                           \
+        if (!(assert_condition)) [[unlikely]] {                                                   \
             LOG_CRITICAL(Debug, __FILE__ ": assert " __VA_ARGS__);                                \
             AssertFailSoftImpl();                                                                  \
         }                                                                                          \