[PATCH] InstCombine: allow converting varargs calls to non-varargs.

[Will Dietz via llvm-commits]

Patch attached.

This helps cleanup code like this:

declare i32 @test17x(i32)
define i32 @test17(i32 %arg) {
entry:
  %call = call i32 (...) bitcast (i32 (i32)* @test17x to i32 (...)*)(i32
%arg)
  ret i32 %call
}

by simplifying into:

define i32 @test17(i32 %arg) {
entry:
  %call = call i32 @test17x(i32 %arg)
  ret i32 %call
}

If this is not something InstCombine should do (ABI concerns perhaps?),
I suggest we add a testcase like the one included to verify and document
this behavior.

Thanks!

~Will
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