[clang] [Clang] add additional tests for -Wshift-bool (PR #130339)

[Aaron Ballman via cfe-commits]

================
@@ -0,0 +1,24 @@
+// RUN: %clang_cc1 -fsyntax-only -Wshift-bool -verify %s
+
+void t() {
+  int x = 10;
+  int y = 1;
+
+  int a = y << x;
+  int b = y >> x;
+
+  int c = 0 << x;
+  int d = 0 >> x;
+
+  int e = y << 1;
+  int f = y >> 1;
+
+  int g = y << -1; // expected-warning {{shift count is negative}}
+  int h = y >> -1; // expected-warning {{shift count is negative}}
+
+  int i = y << 0;
+  int j = y >> 0;
+
+  if ((y << 1) != 0) { }
+  if ((y >> 1) != 0) { }
----------------
AaronBallman wrote:

No, ` (x < z) >> 1;` is what we want to test. In C++ `x < z` results in a `bool`. In C, it results in an `int`.

https://github.com/llvm/llvm-project/pull/130339