[compiler-rt] fix out-of-bounds access in scudo test (#201390)

When `I = 0`, we can't do `Array[I-1]`.

Caught by libcxx hardening.

GitOrigin-RevId: 5708e7fd9eca368b1b519c13a58360a15a263e4f

tests/primary_test.cpp

diff --git a/tests/primary_test.cpp b/tests/primary_test.cpp
index cd4b0b8..bedca93 100644
--- a/tests/primary_test.cpp
+++ b/tests/primary_test.cpp
@@ -561,7 +561,7 @@
   Allocator->pushBlocks(&SizeClassAllocator, ClassId, Array.data(),
                         static_cast<scudo::u32>(Array.size()));
 
-  for (size_t I = 0; I < Array.size(); I++)
+  for (size_t I = 1; I < Array.size(); I++)
     EXPECT_LE(Array[I - 1] & ~Mask, Array[I] & ~Mask)
         << "Array not ordered: index " << I - 1 << " is < index " << I;