Change RHS-style decltype to LHS-style decltype<declval()>.

Seems some compilers don't like the RHS-style decltype specifier.

This should fix the buildbots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228484 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/DebugInfo/PDB/PDBSymbolCompilandDetails.h

@@ -45,6 +45,6 @@ public:
   }
 };
 
-}; // namespace llvm
+} // namespace llvm
 
 #endif // LLVM_DEBUGINFO_PDB_PDBFUNCTION_H

include/llvm/DebugInfo/PDB/PDBSymbolCompilandEnv.h

@@ -29,6 +29,6 @@ public:
   }
 };
 
-}; // namespace llvm
+} // namespace llvm
 
 #endif // LLVM_DEBUGINFO_PDB_PDBSYMBOLCOMPILANDENV_H

include/llvm/DebugInfo/PDB/PDBSymbolCustom.h

@@ -33,6 +33,6 @@ public:
   }
 };
 
-}; // namespace llvm
+} // namespace llvm
 
 #endif // LLVM_DEBUGINFO_PDB_PDBSYMBOLCUSTOM_H

include/llvm/DebugInfo/PDB/PDBSymbolData.h

@@ -51,6 +51,6 @@ public:
   }
 };
 
-}; // namespace llvm
+} // namespace llvm
 
 #endif // LLVM_DEBUGINFO_PDB_PDBSYMBOLDATA_H

unittests/DebugInfo/PDB/PDBApiTest.cpp

@@ -7,6 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <type_traits>
 #include <unordered_map>
 
 #include "llvm/DebugInfo/PDB/IPDBEnumChildren.h"
@@ -60,7 +61,7 @@ namespace std {
 namespace {
 
 #define MOCK_SYMBOL_ACCESSOR(Func)                                             \
-  auto Func() const->decltype(((IPDBRawSymbol *)nullptr)->Func()) override {   \
+  decltype(std::declval<IPDBRawSymbol>().Func()) Func() const override {       \
     typedef decltype(IPDBRawSymbol::Func()) ReturnType;                        \
     return ReturnType();                                                       \
   }