[Bug libgomp/118909] OpenMP reduction array is always allocated on stack, cause stack overflow with large array reduction.

[z00823823 at outlook dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118909

--- Comment #1 from LXYan <z00823823 at outlook dot com> ---
output with address sanitizer:

```
……

test: 0x7f61e971f800
frame address: 0x7f61f8700dd0
test: 0x7f61f7f04820
frame address: 0x7ffdff0f7020
test: 0x7ffdfe8faa60
Allocated 1046695 doubles

test: 0x7f61f4709800
AddressSanitizer:DEADLYSIGNAL
=================================================================
==48539==ERROR: AddressSanitizer: stack-overflow on address 0x7ffdfe8f9ff8 (pc
0x7f61fae474c0 bp 0x000000000070 sp 0x7ffdfe8fa000 T0)
    #0 0x7f61fae474c0 in char_is_one_of
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_format.inc:43
    #1 0x7f61fae474c0 in format_is_integer_conv
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_format.inc:70
    #2 0x7f61fae474c0 in format_get_value_size
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_format.inc:112
    #3 0x7f61fae72979 in printf_get_value_size
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_format.inc:454
    #4 0x7f61fae72979 in printf_common
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_format.inc:526
    #5 0x7f61fae731fa in __interceptor_vprintf
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:1657
    #6 0x7f61fae732d6 in __interceptor_printf
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:1715
    #7 0x555f9c555542 in main._omp_fn.0
/home/lxyan/Code/cpp/poc/src/poc_c/poc_c.c:19
    #8 0x7f61fadcc0b5 in GOMP_parallel
(/lib/x86_64-linux-gnu/libgomp.so.1+0x140b5)
    #9 0x555f9c5553a1 in main /home/lxyan/Code/cpp/poc/src/poc_c/poc_c.c:14
    #10 0x7f61fabfe249 in __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
    #11 0x7f61fabfe304 in __libc_start_main_impl ../csu/libc-start.c:360
    #12 0x555f9c555170 in _start
(/home/lxyan/Code/cpp/poc/src/poc_c/a.out+0x1170)

SUMMARY: AddressSanitizer: stack-overflow
../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors_format.inc:43
in char_is_one_of
==48539==ABORTING
```