[lldb][AArch64] Fix GCS register field detection

Fixes c5840cc.

On platforms where UL is 32 bit, like Windows or 32 bit Linux,
this shift was not correct, so we assumed GCS was not present.

Use ULL instead, to match the other HWCAP constants.

Author: DavidSpickett

lldb/source/Plugins/Process/Utility/RegisterFlagsDetector_arm64.cpp

@@ -17,7 +17,7 @@
 #define HWCAP_ASIMDHP (1ULL << 10)
 #define HWCAP_DIT (1ULL << 24)
 #define HWCAP_SSBS (1ULL << 28)
-#define HWCAP_GCS (1UL << 32)
+#define HWCAP_GCS (1ULL << 32)
 
 #define HWCAP2_BTI (1ULL << 17)
 #define HWCAP2_MTE (1ULL << 18)