[clangd][test] Provide registered targets to lit tests

[kadircet]

Summary

We had tests in clangd (target_info.test) that got enabled only on
systems that know about x86. But they were always disabled as clangd lit config
never registered those targets.

This patch adds those targets as $TARGET$-registered-target

[sammccall]

clang-tools-extra/clangd/test/lit.cfg.py

17

nit: is this return [arch.lower() + '-registered-target' for arch in arch_string.split()]?

clang-tools-extra/clangd/test/lit.cfg.py

 import lit.llvm
 
 lit.llvm.initialize(lit_config, config)
 lit.llvm.llvm_config.use_clang()
 
 config.name = 'Clangd'
 config.suffixes = ['.test']
 config.excludes = ['Inputs']
 config.test_format = lit.formats.ShTest(not lit.llvm.llvm_config.use_lit_shell)
 config.test_source_root = config.clangd_source_dir + "/test"
 config.test_exec_root = config.clangd_binary_dir + "/test"
 
+
+# Used to enable tests based on the required targets. Can be queried with e.g.
+#    REQUIRES: x86-registered-target
+def calculate_arch_features(arch_string):
+  return [arch.lower() + '-registered-target' for arch in arch_string.split()]
+
+
+lit.llvm.llvm_config.feature_config([('--targets-built',
+                                      calculate_arch_features)])
+
 # Clangd-specific lit environment.
 config.substitutions.append(('%clangd-benchmark-dir',
                              config.clangd_binary_dir + "/benchmarks"))
 
 if config.clangd_build_xpc:
   config.available_features.add('clangd-xpc-support')
-