Remove unreachable code. (replace with llvm_unreachable to help GCC where necessary)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148284 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 1 insertions, 5 deletions

diff --git a/lib/VMCore/ConstantsContext.h b/lib/VMCore/ConstantsContext.h
index cfcdf13..4ee4296 100644
--- a/lib/VMCore/ConstantsContext.h
+++ b/lib/VMCore/ConstantsContext.h
@@ -458,7 +458,6 @@ struct ConstantCreator<ConstantExpr, Type, ExprMapKeyType> {
       return new CompareConstantExpr(Ty, Instruction::FCmp, V.subclassdata,
                                      V.operands[0], V.operands[1]);
     llvm_unreachable("Invalid ConstantExpr!");
-    return 0;
   }
 };
 
diff --git a/lib/VMCore/Core.cpp b/lib/VMCore/Core.cpp
index 35315df..82edb3a 100644
--- a/lib/VMCore/Core.cpp
+++ b/lib/VMCore/Core.cpp
@@ -1092,8 +1092,7 @@ LLVMLinkage LLVMGetLinkage(LLVMValueRef Global) {
     return LLVMCommonLinkage;
   }
 
-  // Should never get here.
-  return static_cast<LLVMLinkage>(0);
+  llvm_unreachable("Make GCC's unreachability happy");
 }
 
 void LLVMSetLinkage(LLVMValueRef Global, LLVMLinkage Linkage) {
diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index 8c8fbf9..e0e0709 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -166,8 +166,6 @@ const char *Instruction::getOpcodeName(unsigned OpCode) {
 
   default: return "<Invalid operator> ";
   }
-
-  return 0;
 }
 
 /// isIdenticalTo - Return true if the specified instruction is exactly