Clang 15.x RISCV64 backend segfaults in usdt tests from bpftrace

[kraj]

Attached testcase crashed Clang itself, it only happens on RISC-V64

In file included from /mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux/bpftrace/0.16.0+gita277ec42102c463d656df8f64eb2f7e87e322210-r0/git/tests/testprogs/usdt_semaphore_test.c:8:
In file included from /mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux/bpftrace/0.16.0+gita277ec42102c463d656df8f64eb2f7e87e322210-r0/recipe-sysroot/usr/include/sys/time.h:21:
/mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux/bpftrace/0.16.0+gita277ec42102c463d656df8f64eb2f7e87e322210-r0/recipe-sysroot/usr/include/features.h:412:4: warning: _FORTIFY_SOURCE requires compiling with optimization (-O) [-W#warnings]
#  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
   ^
fatal error: error in backend: Could not match memory address.  Inline asm failure!

[kraj]

usdt_args-37d65f.zip

[Endilll]

Appears to be fixed on post-17 trunk: https://godbolt.org/z/r6GrrxbEn
Reduced by C-Reduce:

void main_array_0_0() {
  __asm__("" ::"nor"(main_array_0_0));
}

[llvmbot]

@llvm/issue-subscribers-backend-risc-v

Attached testcase crashed Clang itself, it only happens on RISC-V64

In file included from /mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux/bpftrace/0.16.0+gita277ec42102c463d656df8f64eb2f7e87e322210-r0/git/tests/testprogs/usdt_semaphore_test.c:8:
In file included from /mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux/bpftrace/0.16.0+gita277ec42102c463d656df8f64eb2f7e87e322210-r0/recipe-sysroot/usr/include/sys/time.h:21:
/mnt/b/yoe/master/build/tmp/work/riscv64-yoe-linux/bpftrace/0.16.0+gita277ec42102c463d656df8f64eb2f7e87e322210-r0/recipe-sysroot/usr/include/features.h:412:4: warning: _FORTIFY_SOURCE requires compiling with optimization (-O) [-W#warnings]
#  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
   ^
fatal error: error in backend: Could not match memory address.  Inline asm failure!

[wangpc-pp]

This has been fixed in [RISCV] Handle "o" inline asm memory constraint.