Fix warnings in assembly blobs. gcc was triggering warnings when building memtest because there were matching assembly constraints which couldn't be put in registers. The constraints were set up that way because there was no way to specify using %ebp, the last available register. Instead of specifying %ebp directly, the code now simply asks for *a* register, and because %ebp is the only one left, it's used. BUG=chromium-os:26458 TEST=Built and ran on Stumpy. Change-Id: I304ea3aa7a04efb6664d9b93621dfc98f1a802e1 Signed-off-by: Gabe Black <gabeblack@google.com>
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