[clang] [Sema] Handle large shift counts in GetExprRange (PR #68590)

[Erich Keane via cfe-commits]

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@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -verify -fsyntax-only -std=c2x -triple=x86_64-unknown-linux %s
+
+// Regression test for bug where we used to hit assertion due to shift amount
+// being larger than 64 bits. We want to see a warning about too large shift
+// amount.
+void test1(int *a)
+{
+  (void)(*a >> 123456789012345678901uwb <= 0); // expected-warning {{shift count >= width of type}}
+}
+
+// Similar to test1 above, but using __uint128_t instead of __BitInt.
+// We want to see a warning about too large shift amount.
+void test2(__uint128_t *a)
+{
+  (void)(*a >> ((__uint128_t)__UINT64_MAX__ + (__uint128_t)1) <= 0); // expected-warning {{shift count >= width of type}}
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erichkeane wrote:

2nd uint128_t cast shouldn't be necessary

https://github.com/llvm/llvm-project/pull/68590