[clang] [clang][bytecode] Move shared interp functions to InterpHelpers.h (PR #164215)

[Oliver Hunt via cfe-commits]

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@@ -22,6 +22,7 @@
 #include "Function.h"
 #include "InterpBuiltinBitCast.h"
 #include "InterpFrame.h"
+#include "InterpHelpers.h"
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ojhunt wrote:

is this include intended to be here still? It seems to negate the move to a separate header, and the inclusion of `InterpHelpers.h` in `Interp.cpp` makes me thinks it's unintentional?

https://github.com/llvm/llvm-project/pull/164215