[LLVMdev] x86 calling conventions refactoring

[Gordon Henriksen]

Hi all,

The attachment supersedes the previous patch. It incorporates some  
feedback from Anton and takes the next step of merging the largely  
duplicated calling convention logic in X86ISelLowering.

LowerCCCArguments, LowerX86_64CCCArguments and LowerFastCCArguments  
are merged and inlined directly into LowerFORMAL_ARGUMENTS.
I moved LowerFORMAL_ARGUMENTS to the location where LowerCCCArguments  
was in order to facilitate review (otherwise the diff would contain no  
useful deltas), but it should go back where it belongs afterwards.
LowerX86_64CCCCallTo and LowerX86_64CCCCallTo were consolidated with  
LowerCCCCallTo.
I haven't yet tackled merging LowerCCCCallTo and LowerTailCallTo.

There net savings is 405 LOC.

I'd appreciate tests on Windows and x86-64 hosts, since some of the  
logic was rather convoluted.

— Gordon

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