Breakpad Linux dumper: Recognize more processor architectures.
Breakpad Linux dumper: Recognize more processor architectures.

This extends the ElfArchitecture function to recognize the
architectures it seemed to me that breakpad was most likely to see.

Also: the dumper has historically not provided very helpful error
messages. This patch adds a few that were convenient, but we should do
an audit for this.

a=jimblandy, r=ted.mielczarek


git-svn-id: a14e546401035be51a469fbea25ecce70a1a22f2@507 4c0a9323-5329-0410-9bdc-e9ce6186880e

tomgr/google-breakpad,tomgr/google-breakpad,tomgr/google-breakpad,tomgr/google-breakpad,tomgr/google-breakpad