[compiler-rt] [asan, test] Make alloca_loop_unpoisoning.cpp robust and fix s390x failure (PR #78774)

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github-actions[bot] wrote:

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git-clang-format --diff 0784b1eefa36d4acbb0dacd2d18796e26313b6c5 3833b05746922726eb5a8b512a8a9f5caf7a96c5 -- compiler-rt/test/asan/TestCases/alloca_loop_unpoisoning.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/compiler-rt/test/asan/TestCases/alloca_loop_unpoisoning.cpp b/compiler-rt/test/asan/TestCases/alloca_loop_unpoisoning.cpp
index bf84ab3d20..0967b34dc7 100644
--- a/compiler-rt/test/asan/TestCases/alloca_loop_unpoisoning.cpp
+++ b/compiler-rt/test/asan/TestCases/alloca_loop_unpoisoning.cpp
@@ -25,12 +25,14 @@ __attribute__((noinline)) void foo(int len) {
   char x;
   top = &x;
   volatile char array[len];
-  if (len) array[0] = 0;
+  if (len)
+    array[0] = 0;
   assert(!(reinterpret_cast<uintptr_t>(array) & 31L));
   alloca(len);
   for (int i = 0; i < 32; ++i) {
     volatile char array[i];
-    if (i) array[0] = 0;
+    if (i)
+      array[0] = 0;
     bot = alloca(i);
     assert(!(reinterpret_cast<uintptr_t>(bot) & 31L));
   }

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https://github.com/llvm/llvm-project/pull/78774