Syntax error in MSVC `add_underspec` (missing closing parenthesis)

[protz]

File: krmllib/c/fstar_uint128_msvc.h:107

Missing ) in the non-optimized path of FStar_UInt128_add_underspec. This path is compiled when targeting 32-bit MSVC (_MSC_VER defined but _M_X64 not defined).

// CURRENT (BROKEN):
  lit.high = a.high + b.high + FStar_UInt128_carry(a.low + b.low, b.low;
  //                                                                   ^ missing ')'

Test snippet:

// Compile on 32-bit MSVC (cl /c /D_MSC_VER /DKRML_VERIFIED_UINT128 test.c):
// error C2143: syntax error: missing ')' before ';'

Suggested fix:

  lit.high = a.high + b.high + FStar_UInt128_carry(a.low + b.low, b.low);

This issue was found by Claude (Opus 4.6)