Tweak trailing whitespace
Update business logic for isInCForLoopHeader for deadExpressionElimination
Merge pull request #893 from noakesmichael/cforHeader

Additional CForLoop refinements

DeadExpressionElimination (removing dead "Statement Expressions") included a step
in which certain expressions were tested by walking up the parent chain to determine if
the expression was embedded in a CForLoop blockInfo.  Convert this test to use the
new tag on BlockStmt.

Also tweak some of the output of AstDumpToNode to squash some of the trailing whitespace.

Compiled STD clang/darwin, STD gcc/linux64, LLVM gcc/linux64
Tested: paratest --verify
Review: None