Make sure float suffixes are parsed out after can

Before we hit mono, we need to make sure the suffixes of numeric
literals are parsed out from the literal string, so that we don't try to
parse something whose type we already know but has the extraneous
suffix.

Co'ed with @tagraves

compiler/can/src/expr.rs

@@ -315,12 +315,7 @@ pub fn canonicalize_expr<'a>(
             (answer, Output::default())
         }
         &ast::Expr::Float(str) => {
-            let answer = float_expr_from_result(
-                var_store,
-                finish_parsing_float(str).map(|(f, bound)| (str, f, bound)),
-                region,
-                env,
-            );
+            let answer = float_expr_from_result(var_store, finish_parsing_float(str), region, env);
 
             (answer, Output::default())
         }