tint/sem: Rename Expression to ValueExpression

ast::IdentifierExpression may also resolve to a type or core enumerator

Bug: tint:1810
Change-Id: I85e3bea67e1146215079ec47430784f2fb39043d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/118402
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: James Price <jrprice@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/src/tint/resolver/resolver_test_helper.h b/src/tint/resolver/resolver_test_helper.h
index d5a6698..f04b697 100644
--- a/src/tint/resolver/resolver_test_helper.h
+++ b/src/tint/resolver/resolver_test_helper.h
@@ -26,8 +26,8 @@
 #include "gtest/gtest.h"
 #include "src/tint/program_builder.h"
 #include "src/tint/resolver/resolver.h"
-#include "src/tint/sem/expression.h"
 #include "src/tint/sem/statement.h"
+#include "src/tint/sem/value_expression.h"
 #include "src/tint/sem/variable.h"
 #include "src/tint/traits.h"
 #include "src/tint/type/abstract_float.h"