Add name to GLSL error message

Change-Id: I03b71d81d4975512d57f7383123689e57eba7735
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/20065
Reviewed-by: David Neto <dneto@google.com>

src/type_determiner.cc

@@ -318,7 +318,8 @@ bool TypeDeterminer::DetermineCall(ast::CallExpression* expr) {
                                         ident->name(), expr->params(), &ext_id);
       if (result_type == nullptr) {
         set_error(expr->source(),
-                  "Unable to determine result type for GLSL expression");
+                  "Unable to determine result type for GLSL expression " +
+                      ident->name());
         return false;
       }