Simplify expressions involving boolean constants with clang-tidy

Patch by Richard (legalize at xmission dot com).

Differential Revision: http://reviews.llvm.org/D8154

llvm-svn: 231617
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 19e3633..49adbc3 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -6198,7 +6198,7 @@
           dyn_cast<ConstantInt>(ConstantExpr::getICmp(CmpInst::ICMP_ULT,
                                                       R1->getValue(),
                                                       R2->getValue()))) {
-        if (CB->getZExtValue() == false)
+        if (!CB->getZExtValue())
           std::swap(R1, R2);   // R1 is the minimum root now.
 
         // We can only use this value if the chrec ends up with an exact zero
@@ -7521,7 +7521,7 @@
       if (ConstantInt *CB =
           dyn_cast<ConstantInt>(ConstantExpr::getICmp(ICmpInst::ICMP_ULT,
                          R1->getValue(), R2->getValue()))) {
-        if (CB->getZExtValue() == false)
+        if (!CB->getZExtValue())
           std::swap(R1, R2);   // R1 is the minimum root now.
 
         // Make sure the root is not off by one.  The returned iteration should