[test][asan] Reduce recursion to avoid stack overflow

D157552 uses 1000 as over pessimistic value.

We don't want to hardcode stack frame sizeclass of the
Thread frame, so iterate various frame sizes to trigger
reuse.

100 is also significantly above Thread frame, but it's
small enough to avoid overflow.

compiler-rt/test/asan/TestCases/Posix/fake_stack_gc.cpp

@@ -3,12 +3,6 @@
 // Check that fake stack does not discard frames on the main stack, when GC is
 // triggered from high alt stack.
 
-// FIXME: Investigate.
-// UNSUPPORTED: android
-
-// FIXME: Fails on Darwin
-// UNSUPPORTED: darwin
-
 #include <algorithm>
 #include <assert.h>
 #include <csignal>
@@ -36,7 +30,7 @@ static void Handler(int signo) {
   // Trigger GC and create a lot of frame to reuse "Thread" frame if it was
   // discarded.
   for (int i = 0; i < 1000; ++i)
-    Fn<1000>();
+    Fn<100>();
   // If we discarder and reused "Thread" frame, the next line will crash with
   // false report.
   *on_thread = 10;