fix copy-paste typo

Author: eduardosm

src/shims/x86/sse.rs

@@ -240,7 +240,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                         | rustc_apfloat::Status::UNDERFLOW,
                 ) {
                     // Input is NaN (flagged with INVALID_OP) or does not fit
-                    // in an i32 (flagged with OVERFLOW or UNDERFLOW), fallback
+                    // in an i64 (flagged with OVERFLOW or UNDERFLOW), fallback
                     // to minimum acording to SSE semantics. The INEXACT flag
                     // is ignored on purpose because rounding can happen during
                     // float-to-int conversion.