[clang] [clang][analyzer] Add StoreToImmutable checker (PR #150417)

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+// RUN: %clang_analyze_cc1 -analyzer-checker=alpha.core.StoreToImmutable %s
+
+// Global const variable
+const int global_const = 42;
+
+void test_global_const() {
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gamesh411 wrote:

Maybe just a single function that tests all use cases would be more succinct.

https://github.com/llvm/llvm-project/pull/150417