File domhtml.c generates a compiler error when using default "-O2":

Assembler messages: Fatal error: Infinite loop encountered whilst attempting to compute the addresses of symbols in section .text

This happens on RiscV running Debian with gcc 12.2.0.

Guarding the following initialization with optimization pragmas, removes the error.

#ifdef __riscv
#pragma GCC push_options
#pragma GCC optimize ("O0")
#endif

static Er er_sequences[] = {
   { "amp",       "&",        0 },
   ...
   { "diams",     "\xE2\x99\xA6",    0 }, 
};
#ifdef __riscv
#pragma GCC pop_options
#endif