Fix MLIR clang-tidy: when tweaking it does not inherit from the parent

It is almost identical to the top-level .clang-tidy, except that
{Member,Parameter,Variable}Case use camelBack.

Author: Mehdi Amini

mlir/.clang-tidy

@@ -1,4 +1,19 @@
-Checks: '-*,readability-identifier-naming'
+# Almost identical to the top-level .clang-tidy, except that {Member,Parameter,Variable}Case use camelBack.
+Checks: '-*,clang-diagnostic-*,llvm-*,misc-*,-misc-unused-parameters,-misc-non-private-member-variables-in-classes,readability-identifier-naming'
 CheckOptions:
-  - { key: readability-identifier-naming.VariableCase,  value: camelBack }
-  - { key: readability-identifier-naming.ParameterCase, value: camelBack }
+  - key:             readability-identifier-naming.ClassCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.EnumCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.FunctionCase
+    value:           camelBack
+  - key:             readability-identifier-naming.MemberCase
+    value:           camelBack
+  - key:             readability-identifier-naming.ParameterCase
+    value:           camelBack
+  - key:             readability-identifier-naming.UnionCase
+    value:           CamelCase
+  - key:             readability-identifier-naming.VariableCase
+    value:           camelBack
+  - key:             readability-identifier-naming.IgnoreMainLikeFunctions
+    value:           1