[llvm-exegesis] Removed useless test

This test was an exact duplicate of the one above, providing no value,
and also adding confusion as it referred to a behavior that (was
presumably) moved around and tested differently during the review
process with the test being forgotten about.

Author: boomanaiden154

llvm/unittests/tools/llvm-exegesis/X86/SnippetFileTest.cpp

@@ -209,15 +209,6 @@ TEST_F(X86SnippetFileTest, MemoryMappingNoDefinition) {
   consumeError(std::move(Error));
 }
 
-TEST_F(X86SnippetFileTest, IncompatibleExecutorMode) {
-  auto Error = TestCommon(R"(
-    # LLVM-EXEGESIS-MEM-MAP test1 4096
-  )")
-                   .takeError();
-  EXPECT_TRUE((bool)Error);
-  consumeError(std::move(Error));
-}
-
 } // namespace
 } // namespace exegesis
 } // namespace llvm