[spirv] Check remapped_entry_point_name in fuzzer

If it is provided, it must not be empty.

Bug: 383200047
Change-Id: I5f985d06c4132058e740e181492202b2e9b28884
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/218814
Auto-Submit: James Price <jrprice@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: James Price <jrprice@google.com>
Commit-Queue: dan sinclair <dsinclair@chromium.org>

src/tint/lang/spirv/writer/writer_fuzz.cc

diff --git a/src/tint/lang/spirv/writer/writer_fuzz.cc b/src/tint/lang/spirv/writer/writer_fuzz.cc
index 857ef02..1f7d866 100644
--- a/src/tint/lang/spirv/writer/writer_fuzz.cc
+++ b/src/tint/lang/spirv/writer/writer_fuzz.cc
@@ -37,7 +37,12 @@
 namespace tint::spirv::writer {
 namespace {
 
-bool CanRun(const core::ir::Module& module) {
+bool CanRun(const core::ir::Module& module, const Options& options) {
+    // If a remapped entry point name is provided, it must not be empty.
+    if (options.remapped_entry_point_name && options.remapped_entry_point_name->empty()) {
+        return false;
+    }
+
     // Check for unsupported module-scope variable address spaces and types.
     for (auto* inst : *module.root_block) {
         auto* var = inst->As<core::ir::Var>();
@@ -50,7 +55,7 @@
 }
 
 Result<SuccessType> IRFuzzer(core::ir::Module& module, const fuzz::ir::Context&, Options options) {
-    if (!CanRun(module)) {
+    if (!CanRun(module, options)) {
         return Failure{"Cannot run module"};
     }