8357155: [asan] ZGC does not work (x86_64 and ppc64)

Co-authored-by: Axel Boldt-Christmas <[email protected]>
Reviewed-by: mdoerr, aboldtch

Author: MBaesken

src/hotspot/cpu/ppc/gc/z/zAddress_ppc.cpp

@@ -93,10 +93,15 @@ static size_t probe_valid_max_address_bit() {
 size_t ZPlatformAddressOffsetBits() {
   static const size_t valid_max_address_offset_bits = probe_valid_max_address_bit() + 1;
   const size_t max_address_offset_bits = valid_max_address_offset_bits - 3;
+#ifdef ADDRESS_SANITIZER
+  // The max supported value is 44 because of other internal data structures.
+  return MIN2(valid_max_address_offset_bits, (size_t)44);
+#else
   const size_t min_address_offset_bits = max_address_offset_bits - 2;
   const size_t address_offset = ZGlobalsPointers::min_address_offset_request();
   const size_t address_offset_bits = log2i_exact(address_offset);
   return clamp(address_offset_bits, min_address_offset_bits, max_address_offset_bits);
+#endif
 }
 
 size_t ZPlatformAddressHeapBaseShift() {

src/hotspot/cpu/x86/gc/z/zAddress_x86.cpp

@@ -30,11 +30,15 @@
 size_t ZPointerLoadShift;
 
 size_t ZPlatformAddressOffsetBits() {
+#ifdef ADDRESS_SANITIZER
+  return 44;
+#else
   const size_t min_address_offset_bits = 42; // 4TB
   const size_t max_address_offset_bits = 44; // 16TB
   const size_t address_offset = ZGlobalsPointers::min_address_offset_request();
   const size_t address_offset_bits = log2i_exact(address_offset);
   return clamp(address_offset_bits, min_address_offset_bits, max_address_offset_bits);
+#endif
 }
 
 size_t ZPlatformAddressHeapBaseShift() {