[compiler rt] Win64 GetInstructionSize additional register MOV + stack alignment AND

Current interception code does not cover all of the required registers
on Windows for a specific flavor of MOV, so this patch adds cases to
identify the following 5-byte instructions on 64-bit Windows:

mov QWORD PTR [rsp + XX], rdx  <- second integer argument
mov QWORD PTR [rsp + XX], r9    <- third integer argument
mov QWORD PTR [rsp + XX], r8    <- fourth integer argument

The instruction for MOV [...] RCX is already covered in the previous
version.

Patch by Matthew McGovern!

Reviewers: rnk

Differential Revision: https://reviews.llvm.org/D57339

llvm-svn: 353483