Coding style. No significant functionality. Abandon linear scan style

Coding style. No significant functionality. Abandon linear scan style
in favor of the widespread llvm style. Capitalize variables and add
newlines for visual parsing. Rename variables for readability.
And other cleanup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120490 91177308-0d34-0410-b5e6-96231b3b80d8