clang SIGSEGV crash with armv7 inline asm and intrinsics

[frobtech]

Attached reproducer causes the compiler to crash.

[llvmbot]

@llvm/issue-subscribers-backend-arm

Author: Roland McGrath (frobtech)

Attached reproducer causes the compiler to crash.

[frobtech]

rsr-b57f4f.sh.txt
rsr-b57f4f.cpp.txt

[davemgreen]

I think it might produce a better error message with #145197.

Something like this might work for what you need.

  uint64_t v1 = __arm_rsr64(REG);
  __asm volatile("" : "+r"(v1) : );