Refactor duplicated code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214328 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/Analysis.h

@@ -97,6 +97,13 @@ bool returnTypeIsEligibleForTailCall(const Function *F,
                                      const ReturnInst *Ret,
                                      const TargetLoweringBase &TLI);
 
+// True if GV can be left out of the object symbol table. This is the case
+// for linkonce_odr values whose address is not significant. While legal, it is
+// not normally profitable to omit them from the .o symbol table. Using this
+// analysis makes sense when the information can be passed down to the linker
+// or we are in LTO.
+bool canBeOmittedFromSymbolTable(const GlobalValue *GV);
+
 } // End llvm namespace
 
 #endif