Clean up clang-format and add a .clangd configuration. (#5075)

Signed-off-by: fruffy <[email protected]>

.clang-format

@@ -1,14 +1,5 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# clang-format configuration file. Intended for clang-format >= 4.
-#
-# For more information, see:
-#
-#   Documentation/process/clang-format.rst
-#   https://clang.llvm.org/docs/ClangFormat.html
-#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
-#
 ---
+Language: Cpp
 BasedOnStyle: Google
 IndentWidth: 4
 FixNamespaceComments: true
@@ -22,16 +13,18 @@ DerivePointerAlignment: false
 PointerAlignment: Right
 Standard: c++17
 IncludeCategories:
-# Matches common headers first and sorts them before project includes
-- Regex: '^<.+/.*\.h>'
-  Priority: 2000
-- Regex: '^<.+/.*>'
-  Priority: 4000
-- Regex: '^<.*\.h>'
-  Priority: 1000
-- Regex: '^<.*>'
-  Priority: 3000
-- Regex: 'testgen/.*'
-  Priority: 6000
-- Regex: '.*'
-  Priority: 5000
+  # Matches common headers first and sorts them before project includes
+  - Regex: '^<.+/.*\.h>'
+    Priority: 2000
+  - Regex: "^<.+/.*>"
+    Priority: 4000
+  - Regex: '^<.*\.h>'
+    Priority: 1000
+  - Regex: "^<.*>"
+    Priority: 3000
+  - Regex: "testgen/.*"
+    Priority: 6000
+  - Regex: ".*"
+    Priority: 5000
+IncludeIsMainRegex: '(_test)?$'
+...

.clangd

@@ -0,0 +1,2 @@
+CompileFlags:
+  CompilationDatabase: build/

test/CMakeLists.txt

@@ -38,7 +38,7 @@ set (GTEST_UNITTEST_SOURCES
   gtest/hvec_map.cpp
   gtest/hvec_set.cpp
   gtest/indexed_vector.cpp
-  gtest/ir-traversal-test.cpp
+  gtest/ir-traversal.cpp
   gtest/json_test.cpp
   gtest/map.cpp
   gtest/midend_def_use.cpp