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

Fixes
#127336 (review)

Author: a-tarasyuk

clang/test/Sema/shift-bool.c

@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -fsyntax-only -Wshift-bool -verify %s
+
+void t() {
+  int x = 10;
+  int y = 5;
+
+  int a = (x < y) << 1;
+  int b = (x < y) >> 1;
+
+  int c = (x > y) << 1;
+  int d = (x > y) >> 1;
+
+  int e = (x == y) << 1;
+  int f = (x == y) >> 1;
+
+  int g = (x != y) << 1;
+  int h = (x != y) >> 1;
+
+  int i = (x < y) << 0;
+  int j = (x < y) >> 0;
+
+  int k = (x < y) << -1; // expected-warning {{shift count is negative}}
+  int l = (x < y) >> -1; // expected-warning {{shift count is negative}}
+
+  if (((x < y) << 1) != 0) { }
+  if (((x < y) >> 1) != 0) { }
+}

clang/test/Sema/shift-bool.cpp

@@ -3,6 +3,7 @@
 void t() {
   int x = 10;
   bool y = true;
+  int z = 1;
 
   bool a = y << x;
   bool b = y >> x; // expected-warning {{right shifting a 'bool' implicitly converts it to 'int'}}
@@ -20,6 +21,8 @@ void t() {
   bool i = y << 0;
   bool j = y >> 0; // expected-warning {{right shifting a 'bool' implicitly converts it to 'int'}}
 
+  bool k = (x < z) >> 1; // expected-warning {{right shifting a 'bool' implicitly converts it to 'int'}}
+
   if ((y << 1) != 0) { }
   if ((y >> 1) != 0) { } // expected-warning {{right shifting a 'bool' implicitly converts it to 'int'}}
 }