[llvm][Patch 1/3] ppc-darwin AsmParser Base implementation.

[Iain Sandoe]

Hi!

@ hal & david - as discussed on irc,

Here is a base patchset that enables powerpc-apple-darwin asm parser.
The total patch is not really very large, but split into three components as discussed (it doesn't make much sense to apply them in isolation, the separation is purely for review).

With the set applied "clang … -integrated-as -save-temps" works for at least a nominal set of examples of C, C++ and ObjC.

==

Part 1. Enables infrastructure (essentially isDarwin()) and fixes up the parsing of asm directives to separate out the ones additional to ELF from those additional to MachO.

Iain
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