X86: Fix a comment and adjust the stack base address. The stack base on my development machine starts one page below where it needs to. I don't know why it does, but I've duplicated it in m5.
X86: Fix a comment and adjust the stack base address.
The stack base on my development machine starts one page below where it needs to. I don't know why it does, but I've duplicated it in m5.

LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,haowu4682/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,haowu4682/gem5