`std.fmt.parseFloat` fails to encode instruction using x86_64 backed on unsafe release modes

[sno2]

Zig Version

0.14.0-dev.3213+53216d2f2

Steps to Reproduce and Observed Behavior

I found this while trying to build https://github.com/ziglang/translate-c without llvm/lld. This most likely regressed from #22873, as I could compile translate-c yesterday without llvm/lld.

Create the following test.zig file:

const std = @import("std");

test {
    // This works for f16, f32, and f64.
    // Both f80 and f128 fail to encode, though.
    _ = try std.fmt.parseFloat(f80, "1.0");
    _ = try std.fmt.parseFloat(f128, "1.0");
}

Now, test the executable in an unsafe release mode (ReleaseFast or ReleaseSmall):

$ zig test test.zig -fno-llvm -fno-lld -OReleaseSmall
error(x86_64_encoder): no encoding found for: none mul ymm none none none
/home/sno2/projects/zig/lib/std/fmt/parse_float/decimal.zig:186:13: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
        pub fn rightShift(self: *Self, shift: usize) void {
        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ zig test test.zig -fno-llvm -fno-lld -OReleaseSmall
error(x86_64_encoder): no encoding found for: none mul ymm none none none
/home/sno2/projects/zig/lib/std/fmt/parse_float/decimal.zig:186:13: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
        pub fn rightShift(self: *Self, shift: usize) void {
        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thanks

Expected Behavior

The test should run and pass like when in Debug mode:

$ zig test test.zig -fno-llvm -fno-lld
All 1 tests passed.

[sno2]

Further reduction (follow the same steps above):

test {
    var n: u128 = 0;
    n = (10 * (n & 1));
}

$ zig test test.zig -fno-llvm -fno-lld -OReleaseSmall
error(x86_64_encoder): no encoding found for: none mul ymm none none none
test.zig:1:1: error: emit MIR failed: InvalidInstruction (Zig compiler bug)
test {
^~~~

[sno2]

Fixed on master - most likely from #22913