Add explicit keywords.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44234 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index 0bacf0f..aa78e7c 100644
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -123,7 +123,7 @@
     void operator=(const ConstantPlaceHolder &); // DO NOT IMPLEMENT
   public:
     Use Op;
-    ConstantPlaceHolder(const Type *Ty)
+    explicit ConstantPlaceHolder(const Type *Ty)
       : ConstantExpr(Ty, Instruction::UserOp1, &Op, 1),
         Op(UndefValue::get(Type::Int32Ty), this) {
     }
diff --git a/lib/Bitcode/Writer/BitcodeWriterPass.cpp b/lib/Bitcode/Writer/BitcodeWriterPass.cpp
index 8de7ffb..5751204 100644
--- a/lib/Bitcode/Writer/BitcodeWriterPass.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriterPass.cpp
@@ -20,7 +20,8 @@
     std::ostream &Out;                 // ostream to print on
   public:
     static char ID; // Pass identifcation, replacement for typeid
-    WriteBitcodePass(std::ostream &o) : ModulePass((intptr_t) &ID), Out(o) {}
+    explicit WriteBitcodePass(std::ostream &o)
+      : ModulePass((intptr_t) &ID), Out(o) {}
     
     const char *getPassName() const { return "Bitcode Writer"; }