[clang-tools-extra] [clang-tidy] Add readability-default-lambda-capture (PR #160150)

[JJ Marr via cfe-commits]

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@@ -0,0 +1,110 @@
+// RUN: %check_clang_tidy %s readability-avoid-default-lambda-capture %t
+
+void test_default_captures() {
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jjmarr-amd wrote:

add a test for the fancy new form of lambda-capture where an assignment happens.

https://github.com/llvm/llvm-project/pull/160150