C backend produces incomplete source code for calls to functions with large integer parameters

[amp-59]

Zig Version

0.13.0-dev.211+6a65561e3

Steps to Reproduce and Observed Behaviour

Test example program with zig test -ofmt=c cbe_nextafter_error.zig
cbe_nextafter_error.zig:

fn f2(_: u129) void {}
fn f1(data: struct { x: u128 }) void {
    f2(data.x);
}
export fn entry() void {
    f1(.{ .x = 0 });
}
test {
    entry();
}

Output:

zig test -ofmt=c cbe_nextafter_error.zig
~/.local/share/test/zig-cache/o/19d550fa7f176a5ec3f23371e9ffc1d4/test.c:8214:7: error: call to undeclared function 'zig_make_big'; ISO C99 and later do not support implicit function declarations
 t1 = zig_make_big(zig_hi_u128(t0), zig_lo_u128(t0));
      ^
~/.local/share/test/zig-cache/o/19d550fa7f176a5ec3f23371e9ffc1d4/test.c:8214:5: error: array type 'zig_u128[2]' (aka 'unsigned __int128[2]') is not assignable
 t1 = zig_make_big(zig_hi_u128(t0), zig_lo_u128(t0));
 ~~~^
error: the following test command failed with exit code 1:
~/.local/src/zig-linux-x86_64-0.13.0-dev.211+6a65561e3/zig run -I ~/.local/src/zig-linux-x86_64-0.13.0-dev.211+6a65561e3/lib ~/.local/share/test/zig-cache/o/19d550fa7f176a5ec3f23371e9ffc1d4/test.c