Adding support for MSVC #pragma detect_mismatch functionality by emitting a FAILIFMISMATCH linker command into the object file.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183178 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TargetInfo.h b/lib/CodeGen/TargetInfo.h
index dee7fd8..b0ddebc 100644
--- a/lib/CodeGen/TargetInfo.h
+++ b/lib/CodeGen/TargetInfo.h
@@ -173,6 +173,12 @@
     /// platform.
     virtual void getDependentLibraryOption(llvm::StringRef Lib,
                                            llvm::SmallString<24> &Opt) const;
+
+    /// Gets the linker options necessary to detect object file mismatches on
+    /// this platform.
+    virtual void getDetectMismatchOption(llvm::StringRef Name,
+                                         llvm::StringRef Value,
+                                         llvm::SmallString<32> &Opt) const {}
   };
 }