[PATCH] [Object, MachO] Don't crash on parsing invalid MachO header.

[Filipe Cabecinhas]

LGTM


================
Comment at: test/Object/macho-invalid.test:41
@@ -38,1 +40,2 @@
 INVALID-SECTION-IDX-SYMBOL-SEC: getSymbolSection: Invalid section index
+INVALID-HEADER: Invalid data was encountered while parsing the file.
----------------
If you're expecting to add a lot of these, we might want to start putting the expected error next to the respective run line, instead of all the run lines and then all the errors.
(Both are ok with me, we can also wait until it gets unreadable and then change)

http://reviews.llvm.org/D10227

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