[WinEH] Allocate space in funclets stack to save XMM CSRs

Summary:
This is an alternate approach to D57970.
Currently funclets reuse the same stack slots that are used in the
parent function for saving callee-saved xmm registers. If the parent
function modifies a callee-saved xmm register before an excpetion is
thrown, the catch handler will overwrite the original saved value.

This patch allocates space in funclets stack for saving callee-saved xmm
registers and uses RSP instead RBP to access memory.

Reviewers: andrew.w.kaylor, LuoYuanke, annita.zhang, craig.topper,
RKSimon

Subscribers: rnk, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63396



Signed-off-by: pengfei <pengfei.wang@intel.com>
llvm-svn: 367088