Fix incomplete bitCast in bit shifts

Closes #217

Author: steeve

src/Translator.zig

@@ -2681,7 +2681,7 @@ fn transShiftExpr(t: *Translator, scope: *Scope, bin: Node.Binary, op_id: ZigTag
     // lhs >> @intCast(rh)
     const lhs = try t.transExpr(scope, bin.lhs, .used);
 
-    const rhs = try t.transExprCoercing(scope, bin.rhs, .used);
+    const rhs = try t.transExpr(scope, bin.rhs, .used);
     const rhs_casted = try ZigTag.int_cast.create(t.arena, rhs);
 
     return t.createBinOpNode(op_id, lhs, rhs_casted);

test/cases/translate/bitshift.c

@@ -5,5 +5,5 @@ int foo(void) {
 // translate
 //
 // pub export fn foo() c_int {
-//     return (@as(c_int, 1) << @intCast(2)) >> @intCast(1);
+//     return (@as(c_int, 1) << @intCast(@as(c_int, 2))) >> @intCast(@as(c_int, 1));
 // }

test/cases/translate/bitshift_with_bitcast.c

@@ -0,0 +1,9 @@
+unsigned int bit31() {
+    return 1u << (31);
+}
+
+// translate
+//
+// pub export fn bit31() c_uint {
+//     return @as(c_uint, 1) << @intCast(@as(c_uint, @bitCast(@as(c_int, @as(c_int, 31)))));
+// }