MdeModulePkg/Core/Dxe: Fixed compilation after rebasing upon new master. #469

Job	Run time
Linux CLANGDWARF	22m 20s
Linux CLANGPDB	20m 21s
Linux GCC	18m 59s
macOS XCODE5	16m 13s
Windows VS2019	28m 24s
Test (Ovmf, Ia32,X64,3264, XCODE5, RELEASE,DEBUG,NOOPT)	18m 11s
Test (Ovmf, Ia32,X64,3264, VS2019, RELEASE,DEBUG,NOOPT)	18m 9s
Test (Ovmf, Ia32,X64,3264, CLANGPDB, RELEASE,DEBUG,NOOPT)	15m 40s
Test (Ovmf, Ia32,X64,3264, CLANGDWARF, RELEASE,DEBUG,NOOPT)	17m 59s
Test (Ovmf, Ia32,X64,3264, GCC, RELEASE,DEBUG,NOOPT)	17m 50s
	3h 14m 6s

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