Found this by accident in C:\Program Files (x86)\Windows Kits\8.1\Include\um\DbgHelp.h :(
ImageRvaToVa(
_In_ PIMAGE_NT_HEADERS NtHeaders,
_In_ PVOID Base,
_In_ ULONG Rva,
_In_opt_ OUT PIMAGE_SECTION_HEADER *LastRvaSection
);
#ifndef _WIN64
// This api won't be ported to Win64 - Fix your code.
typedef struct _IMAGE_DEBUG_INFORMATION {
LIST_ENTRY List;
No IMAGE_DEBUG_INFORMATION structure in 64-bit code...