corelib/global/qsimd.cpp has some narrowing integral warnings

 static void cpuidFeatures07_00(uint &ebx, uint &ecx, uint &edx)
{
#if defined(Q_CC_GNU) && !defined(Q_CC_EMSCRIPTEN)
    qregisteruint rbx; // in case it's 64-bit
    qregisteruint rcx = 0;
    qregisteruint rdx = 0;

src/corelib/global/qsimd.cpp:355:11: warning: implicit conversion loses integer precision: 'qregisteruint' (aka 'unsigned long long') to 'uint' (aka 'unsigned int') [-Wshorten-64-to-32]
  355 |     ebx = rbx;
      |         ~ ^~~
src/corelib/global/qsimd.cpp:356:11: warning: implicit conversion loses integer precision: 'qregisteruint' (aka 'unsigned long long') to 'uint' (aka 'unsigned int') [-Wshorten-64-to-32]
  356 |     ecx = rcx;
      |         ~ ^~~
src/corelib/global/qsimd.cpp:357:11: warning: implicit conversion loses integer precision: 'qregisteruint' (aka 'unsigned long long') to 'uint' (aka 'unsigned int') [-Wshorten-64-to-32]
  357 |     edx = rdx;
      |         ~ ^~~