macOS: Disable PCRE JIT when running under Rosetta

Although the Apple docs claim that Rosetta can translate apps that
contain just-in-time (JIT) compilers, it seems to have problems with
the PCRE JIT.

https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment

To be on the safe side we disable the JIT explicitly when detecting that
we are running under Rosetta. It's already disabled when we're running
on macOS ARM natively (see 2f8df4d1a8).

Fixes: QTBUG-97085
Pick-to: 6.2
Change-Id: I0e133939f28087560d4bc8354b7e49013e94a9f9
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/corelib/text/qregularexpression.cpp

@@ -52,6 +52,10 @@
 #include <QtCore/qatomic.h>
 #include <QtCore/qdatastream.h>
 
+#if defined(Q_OS_MACOS)
+#include <QtCore/private/qcore_mac_p.h>
+#endif
+
 #define PCRE2_CODE_UNIT_WIDTH 16
 
 #include <pcre2.h>
@@ -1011,6 +1015,8 @@ static bool isJitEnabled()
 
 #ifdef QT_DEBUG
     return false;
+#elif defined(Q_OS_MACOS)
+    return !qt_mac_runningUnderRosetta();
 #else
     return true;
 #endif