[IR] DISubprogram::toSPFlags(): fix "enumeral and non-enumeral type in conditional expression"

/build/llvm/include/llvm/IR/DebugInfoMetadata.h: In static member function ‘static llvm::DISubprogram::DISPFlags llvm::DISubprogram::toSPFlags(bool, bool, bool, unsigned int)’:
/build/llvm/include/llvm/IR/DebugInfoMetadata.h:1636:50: warning: enumeral and non-enumeral type in conditional expression [-Wextra]
                                   (IsLocalToUnit ? SPFlagLocalToUnit : 0) |
                                    ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/build/llvm/include/llvm/IR/DebugInfoMetadata.h:1637:49: warning: enumeral and non-enumeral type in conditional expression [-Wextra]
                                   (IsDefinition ? SPFlagDefinition : 0) |
                                    ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/build/llvm/include/llvm/IR/DebugInfoMetadata.h:1638:48: warning: enumeral and non-enumeral type in conditional expression [-Wextra]
                                   (IsOptimized ? SPFlagOptimized : 0));
                                    ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~

llvm-svn: 347250