[llvm] Fix llvm::StripTemplateParameters to not return an empty name. (PR #157553)

[Felipe de Azevedo Piovezan via llvm-commits]

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@@ -299,4 +299,18 @@ TEST(DWARFDebugNames, UnsupportedForm) {
       Sections,
       FailedWithMessage("unsupported Form for YAML debug_names emitter"));
 }
+
+TEST(DWARFDebugNames, TestStripTemplateParameters) {
+
+  std::optional<StringRef> stripped_name;
+  // Make sure we can extract the name "foo" from the template parameters.
+  stripped_name = StripTemplateParameters("foo<int>");
+  ASSERT_TRUE(stripped_name.has_value());
+  ASSERT_EQ(*stripped_name, StringRef("foo"));
+  // Make sure that we don't get an empty name back when the string starts with
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felipepiovezan wrote:

the comment says "we DON'T get an empty name", but the assert seems to be the opposite? 

https://github.com/llvm/llvm-project/pull/157553