fix Windows stdout/stderr

Author: RalfJung

src/fn_call.rs

@@ -596,12 +596,12 @@ pub trait EvalContextExt<'a, 'mir, 'tcx: 'a+'mir>: crate::MiriEvalContextExt<'a,
                 this.write_scalar(Scalar::from_uint(key, dest.layout.size), dest)?;
             }
             "TlsGetValue" => {
-                let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
+                let key = this.read_scalar(args[0])?.to_usize(this)? as u128;
                 let ptr = this.machine.tls.load_tls(key)?;
                 this.write_scalar(ptr, dest)?;
             }
             "TlsSetValue" => {
-                let key = this.read_scalar(args[0])?.to_bits(args[0].layout.size)?;
+                let key = this.read_scalar(args[0])?.to_usize(this)? as u128;
                 let new_ptr = this.read_scalar(args[1])?.not_undef()?;
                 this.machine.tls.store_tls(key, new_ptr)?;
 
@@ -615,7 +615,7 @@ pub trait EvalContextExt<'a, 'mir, 'tcx: 'a+'mir>: crate::MiriEvalContextExt<'a,
                 this.write_scalar(handle, dest)?;
             }
             "WriteFile" => {
-                let handle = this.read_scalar(args[0])?.to_i32()?;
+                let handle = this.read_scalar(args[0])?.to_isize(this)?;
                 let buf = this.read_scalar(args[1])?.not_undef()?;
                 let n = this.read_scalar(args[2])?.to_usize(&*this.tcx)?;
                 let written_place = this.deref_operand(args[3])?;