Fix PR15293: ARM codegen ice - expected larger existing stack allocation

[Stepan Dyatkovskiy]

Hi,

>> [code]
>> target triple = "arm--linux-gnueabihf"
>> define void @t(i32 %a, %struct.s* byval %s, ...) nounwind {
>> define void @caller() {
>>   call void (i32, %struct.s*, ...)* @t(i32 0, %struct.s* @v, i32 777);
>>   ret void
>> }
>> [/code]
Full example is attached as test5.ll.

As prototype for case when two byval structs are used maybe something 
like this:
%struct.s = type { i32 } ; May be some packed structure
define void @t(i32 %a, %struct.s* byval %s1, %struct.s* byval %s2, ...)

I wrote very-very draft concept patch. I still have some issues in 
LowerFormalArguments part. The draft is attached also. I'll also try to 
reduce number of new methods in CCState.

-Stepan.
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target triple = "arm--linux-gnueabihf"

%struct.s = type { [4 x i32] }
@v = constant %struct.s zeroinitializer; 

declare void @f(%struct.s* %p);

define void @t(i32 %a, %struct.s* byval %s, ...) nounwind {
entry:
  call void @f(%struct.s* %s)
  ret void
}

define void @caller() {
  call void (i32, %struct.s*, ...)* @t(i32 0, %struct.s* @v, i32 777);
  ret void
}
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