[PATCH] D13120: [Function] Clean up {prefix, prologue} data routines (NFC)

[Vedant Kumar via llvm-commits]

vsk created this revision.
vsk added a reviewer: pcc.
vsk added a subscriber: llvm-commits.

Factor out some common code used to get+set function prefix/prologue
data. This may come in handy if we ever decide to store personality
functions in the same way we store prefix/prologue data.

Also, update the number of bits to reflect how many we actually use to
store calling convention identifiers.

http://reviews.llvm.org/D13120

Files:
  include/llvm/IR/Function.h
  lib/IR/Function.cpp
  lib/IR/LLVMContextImpl.h

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