extend machine stacks when sanitizers are there

It seems sanitizers require extra amount of machine stacks.  Without
extending them the process tends to stack overflow.

vm_core.h

@@ -698,6 +698,18 @@ typedef struct rb_vm_struct {
 #define RUBY_VM_FIBER_MACHINE_STACK_SIZE_MIN  (  16 * 1024 * sizeof(VALUE)) /*   64 KB or  128 KB */
 #endif
 
+#if __has_feature(memory_sanitizer) || __has_feature(address_sanitizer)
+/* It seems sanitizers consume A LOT of machine stacks */
+#undef  RUBY_VM_THREAD_MACHINE_STACK_SIZE
+#define RUBY_VM_THREAD_MACHINE_STACK_SIZE     (1024 * 1024 * sizeof(VALUE))
+#undef  RUBY_VM_THREAD_MACHINE_STACK_SIZE_MIN
+#define RUBY_VM_THREAD_MACHINE_STACK_SIZE_MIN ( 512 * 1024 * sizeof(VALUE))
+#undef  RUBY_VM_FIBER_MACHINE_STACK_SIZE
+#define RUBY_VM_FIBER_MACHINE_STACK_SIZE      ( 256 * 1024 * sizeof(VALUE))
+#undef  RUBY_VM_FIBER_MACHINE_STACK_SIZE_MIN
+#define RUBY_VM_FIBER_MACHINE_STACK_SIZE_MIN  ( 128 * 1024 * sizeof(VALUE))
+#endif
+
 /* optimize insn */
 #define INTEGER_REDEFINED_OP_FLAG (1 << 0)
 #define FLOAT_REDEFINED_OP_FLAG  (1 << 1)