Provide a fast "get me the target triple from the module" API. This can

drastically reduce the linking time during LTO.

Patch by Shantonu Sen!

llvm-svn: 115728

llvm/lib/Bitcode/Reader/BitcodeReader.h

@@ -212,6 +212,10 @@ public:
   /// @brief Main interface to parsing a bitcode buffer.
   /// @returns true if an error occurred.
   bool ParseBitcodeInto(Module *M);
+
+  /// @brief Cheap mechanism to just extract module triple
+  /// @returns true if an error occurred.
+  bool ParseTriple(std::string &Triple);
 private:
   const Type *getTypeByID(unsigned ID, bool isTypeTable = false);
   Value *getFnValueByID(unsigned ID, const Type *Ty) {
@@ -270,6 +274,7 @@ private:
   bool ResolveGlobalAndAliasInits();
   bool ParseMetadata();
   bool ParseMetadataAttachment();
+  bool ParseModuleTriple(std::string &Triple);
 };
   
 } // End llvm namespace