Jit64: Recompile asm routines on cache clear

This is needed so that the checks added in the previous commit will be
reevaluated if the value of m_enable_dcache changes.

JitArm64 was already recompiling its asm routines on cache clear by
necessity. It doesn't have the same setup as Jit64 where the asm
routines are in a separate region, so clearing the JitArm64 cache
results in the asm routines being cleared too.

Source/Core/VideoCommon/VertexLoaderX64.cpp

@@ -49,7 +49,7 @@ VertexLoaderX64::VertexLoaderX64(const TVtxDesc& vtx_desc, const VAT& vtx_att)
   AllocCodeSpace(4096);
   ClearCodeSpace();
   GenerateVertexLoader();
-  WriteProtect();
+  WriteProtect(true);
 
   Common::JitRegister::Register(region, GetCodePtr(), "VertexLoaderX64\nVtx desc: \n{}\nVAT:\n{}",
                                 vtx_desc, vtx_att);