Ring3: Refactored out CoreRsp and UserStackTop. #574

Job	Run time
Linux CLANGPDB	20m 20s
Linux GCC	19m 55s
macOS XCODE5	15m 24s
Linux CLANGDWARF	21m 4s
Windows VS2019	31m 19s
Test (Ovmf, Ia32,X64,3264, XCODE5, RELEASE,DEBUG,NOOPT)	7m 58s
Test (Ovmf, Ia32,X64,3264, VS2019, RELEASE,DEBUG,NOOPT)	8m 15s
Test (Ovmf, Ia32,X64,3264, CLANGPDB, RELEASE,DEBUG,NOOPT)	8m 30s
Test (Ovmf, Ia32,X64,3264, CLANGDWARF, RELEASE,DEBUG,NOOPT)	8m 10s
Test (Ovmf, Ia32,X64,3264, GCC, RELEASE,DEBUG,NOOPT)	7m 57s
	2h 28m 52s

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