[clang] [clang-format] Add an option to format integer and float literal case (PR #151590)

[via cfe-commits]

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@@ -0,0 +1,354 @@
+//===- unittest/Format/NumericLiteralCaseTest.cpp -------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "FormatTestBase.h"
+
+#define DEBUG_TYPE "numeric-literal-case-test"
+
+namespace clang {
+namespace format {
+namespace test {
+namespace {
+
+class NumericLiteralCaseTest : public FormatTestBase {};
+
+TEST_F(NumericLiteralCaseTest, Prefix) {
+  FormatStyle Style = getLLVMStyle();
----------------
owenca wrote:

```suggestion
  auto Style = getLLVMStyle();
```
Here and elsewhere.

https://github.com/llvm/llvm-project/pull/151590