Fix and update the bitcounts for veclib enum

Author: Rohit Aggarwal

clang/include/clang/Basic/CodeGenOptions.def

@@ -389,7 +389,7 @@ ENUM_CODEGENOPT(Inlining, InliningMethod, 2, NormalInlining)
 VALUE_CODEGENOPT(InlineMaxStackSize, 32, UINT_MAX)
 
 // Vector functions library to use.
-ENUM_CODEGENOPT(VecLib, llvm::driver::VectorLibrary, 3, llvm::driver::VectorLibrary::NoLibrary)
+ENUM_CODEGENOPT(VecLib, llvm::driver::VectorLibrary, 4, llvm::driver::VectorLibrary::NoLibrary)
 
 /// The default TLS model to use.
 ENUM_CODEGENOPT(DefaultTLSModel, TLSModel, 2, GeneralDynamicTLSModel)