Refactor: Simplify boolean conditional return statements in lib/CodeGen.

Patch by Richard.

llvm-svn: 251213
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
index 91fbf6a..4fd1c4b 100644
--- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
@@ -686,10 +686,7 @@
   }
 
   // If we did not find a more suitable source, there is nothing to optimize.
-  if (CurSrcPair.Reg == Reg)
-    return false;
-
-  return true;
+  return CurSrcPair.Reg != Reg;
 }
 
 /// \brief Insert a PHI instruction with incoming edges \p SrcRegs that are