add ImmTy::try_from_(u)int methods

Author: pvdrz

src/librustc_mir/interpret/operand.rs

@@ -218,14 +218,23 @@ impl<'tcx, Tag: Copy> ImmTy<'tcx, Tag> {
         ImmTy { imm: val.into(), layout }
     }
 
+    #[inline]
+    pub fn try_from_uint(i: impl Into<u128>, layout: TyLayout<'tcx>) -> InterpResult<'tcx, Self> {
+        Ok(Self::from_scalar(Scalar::try_from_uint(i, layout.size)?, layout))
+    }
     #[inline]
     pub fn from_uint(i: impl Into<u128>, layout: TyLayout<'tcx>) -> Self {
-        Self::from_scalar(Scalar::from_uint(i, layout.size), layout)
+        Self::try_from_uint(i, layout).unwrap()
+    }
+
+    #[inline]
+    pub fn try_from_int(i: impl Into<i128>, layout: TyLayout<'tcx>) -> InterpResult<'tcx, Self> {
+        Ok(Self::from_scalar(Scalar::try_from_int(i, layout.size)?, layout))
     }
 
     #[inline]
     pub fn from_int(i: impl Into<i128>, layout: TyLayout<'tcx>) -> Self {
-        Self::from_scalar(Scalar::from_int(i, layout.size), layout)
+        Self::try_from_int(i, layout).unwrap()
     }
 
     #[inline]