Fix prologue detection for PNaCl.

Recognize mov %ebp,%reg // push %reg sequence as push %rbp to detect
prologue in PNaCl code.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3600
TEST= None
R=eaeltsin@google.com

Review URL: https://codereview.chromium.org/22393004
1 file changed