[compiler-rt] [llvm] [asan] Catch `initialization-order-fiasco` in modules without globals (PR #104621)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu` running on `sie-linux-worker3` while building `compiler-rt,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/3497

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: CodeGen/sanitize-ignorelist-mainfile.c' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/CodeGen/Output/sanitize-ignorelist-mainfile.c.tmp && split-file /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/CodeGen/Output/sanitize-ignorelist-mainfile.c.tmp && cd /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/CodeGen/Output/sanitize-ignorelist-mainfile.c.tmp
+ rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/CodeGen/Output/sanitize-ignorelist-mainfile.c.tmp
+ split-file /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/CodeGen/Output/sanitize-ignorelist-mainfile.c.tmp
+ cd /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/CodeGen/Output/sanitize-ignorelist-mainfile.c.tmp
RUN: at line 3: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang -cc1 -internal-isystem /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/lib/clang/20/include -nostdsysteminc -emit-llvm -triple x86_64 -fsanitize=address,alignment a.c -o - | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c --check-prefixes=CHECK,DEFAULT
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang -cc1 -internal-isystem /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/lib/clang/20/include -nostdsysteminc -emit-llvm -triple x86_64 -fsanitize=address,alignment a.c -o -
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c --check-prefixes=CHECK,DEFAULT
RUN: at line 4: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang -cc1 -internal-isystem /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/lib/clang/20/include -nostdsysteminc -emit-llvm -triple x86_64 -fsanitize=address,alignment -fsanitize-ignorelist=a.list a.c -o - | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c --check-prefixes=CHECK,IGNORE
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang -cc1 -internal-isystem /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/lib/clang/20/include -nostdsysteminc -emit-llvm -triple x86_64 -fsanitize=address,alignment -fsanitize-ignorelist=a.list a.c -o -
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c --check-prefixes=CHECK,IGNORE
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c:35:16: error: IGNORE-NOT: excluded string found in input
// IGNORE-NOT: @___asan_gen_
               ^
<stdin>:9:1: note: found here
 at ___asan_gen_ = private constant [4 x i8] c"a.c\00", align 1
^~~~~~~~~~~~~

Input file: <stdin>
Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/CodeGen/sanitize-ignorelist-mainfile.c

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            1: ; ModuleID = 'a.c' 
            2: source_filename = "a.c" 
            3: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128" 
            4: target triple = "x86_64" 
            5:  
            6:  at global_h = global i32 0, no_sanitize_address, align 4 
            7:  at global_c = global i32 0, no_sanitize_address, align 4 
            8:  at llvm.used = appending global [1 x ptr] [ptr @asan.module_ctor], section "llvm.metadata" 
            9:  at ___asan_gen_ = private constant [4 x i8] c"a.c\00", align 1 
not:35         !~~~~~~~~~~~~                                                 error: no match expected
           10:  at llvm.global_ctors = appending global [1 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 1, ptr @asan.module_ctor, ptr null }] 
           11:  
           12: ; Function Attrs: noinline nounwind optnone 
           13: define dso_local i32 @foo(ptr noundef %x) #0 { 
           14: entry: 
           15:  %x.addr = alloca ptr, align 8 
           16:  store ptr %x, ptr %x.addr, align 8 
           17:  %0 = load ptr, ptr %x.addr, align 8 
           18:  %call = call i32 @load(ptr noundef %0) 
           19:  ret i32 %call 
           20: } 
...

```

https://github.com/llvm/llvm-project/pull/104621