Implement SRA for global variables. This allows the other global variable

optimizations to trigger much more often.  This allows the elimination of
several dozen more global variables in Programs/External.  Note that we only
do this for non-constant globals: constant globals will already be optimized
out if the accesses to them permit it.

This implements Transforms/GlobalOpt/globalsra.llx


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16842 91177308-0d34-0410-b5e6-96231b3b80d8

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