[clangd] Add test for GH75115

Add test for #75115

Author: mizvekov

clang-tools-extra/clangd/test/GH75115.test

@@ -0,0 +1,12 @@
+// RUN: rm -rf %t.dir && mkdir -p %t.dir
+// RUN: echo '[{"directory": "%/t.dir", "command": "clang --target=x86_64-pc-windows-msvc -x c GH75115.test", "file": "GH75115.test"}]' > %t.dir/compile_commands.json
+// RUN: not --crash clangd -enable-config=0 --compile-commands-dir=%t.dir -check=%s 2>&1 | FileCheck -strict-whitespace %s
+
+// FIXME: Crashes
+
+// CHECK: Building preamble...
+// CHECK-NEXT: Built preamble
+// CHECK-NEXT: Indexing headers...
+// CHECK-NEXT: !KeyInfoT::isEqual(Val, EmptyKey) && !KeyInfoT::isEqual(Val, TombstoneKey) && "Empty/Tombstone value shouldn't be inserted into map!"
+
+#define assert