[tint][ir][val] Split up unittests into multiple files

Breaks up the tests in validator_test.cc into different files of
conceptually connected tests, i.e. 'builtins', 'types', etc. This
helps get the size of the testing files to a couple of kLOC each
instead of previous ~11kLOC single file.

The actual implementation the common test fixture and a variety of
misc tests are left in validator_test.cc.

This CL is primarily just moving existing code around, and not
intended to be a systematic refactoring of the existing tests.

Fixes: 388064480

Change-Id: Ie33da1fc4813e23535e162a152159e94721f3a58
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/221496
Auto-Submit: Ryan Harrison <[email protected]>
Reviewed-by: dan sinclair <[email protected]>
Commit-Queue: Ryan Harrison <[email protected]>

src/tint/lang/core/ir/BUILD.bazel

@@ -230,7 +230,15 @@ cc_library(
     "traverse_test.cc",
     "unreachable_test.cc",
     "user_call_test.cc",
+    "validator_access_test.cc",
+    "validator_builtin_test.cc",
+    "validator_call_test.cc",
+    "validator_flow_control_test.cc",
+    "validator_function_test.cc",
     "validator_test.cc",
+    "validator_test.h",
+    "validator_type_test.cc",
+    "validator_value_test.cc",
     "value_test.cc",
     "var_test.cc",
   ],

src/tint/lang/core/ir/BUILD.cmake

@@ -236,7 +236,15 @@ tint_add_target(tint_lang_core_ir_test test
   lang/core/ir/traverse_test.cc
   lang/core/ir/unreachable_test.cc
   lang/core/ir/user_call_test.cc
+  lang/core/ir/validator_access_test.cc
+  lang/core/ir/validator_builtin_test.cc
+  lang/core/ir/validator_call_test.cc
+  lang/core/ir/validator_flow_control_test.cc
+  lang/core/ir/validator_function_test.cc
   lang/core/ir/validator_test.cc
+  lang/core/ir/validator_test.h
+  lang/core/ir/validator_type_test.cc
+  lang/core/ir/validator_value_test.cc
   lang/core/ir/value_test.cc
   lang/core/ir/var_test.cc
 )

src/tint/lang/core/ir/BUILD.gn

@@ -231,7 +231,15 @@ if (tint_build_unittests) {
       "traverse_test.cc",
       "unreachable_test.cc",
       "user_call_test.cc",
+      "validator_access_test.cc",
+      "validator_builtin_test.cc",
+      "validator_call_test.cc",
+      "validator_flow_control_test.cc",
+      "validator_function_test.cc",
       "validator_test.cc",
+      "validator_test.h",
+      "validator_type_test.cc",
+      "validator_value_test.cc",
       "value_test.cc",
       "var_test.cc",
     ]

src/tint/lang/core/ir/validator.cc

@@ -30,7 +30,6 @@
 #include <algorithm>
 #include <cstdint>
 #include <functional>
-#include <memory>
 #include <string>
 #include <string_view>
 #include <utility>