[cfe-commits] patch: add -fno-optimize-sibling-calls

[Nick Lewycky]

This patch adds support for the -fno-optimize-sibling-calls flag. The
driver lowers -fno-optimize-sibling-calls to -mdisable-tail-calls and cc1
will ask llvm to not do any tail/sibling call optimization in the codegen
layer. Thus far this is only implemented in LLVM's x86 backend.

The goal is to produce better ASAN reports by preserving correct call
stacks, though I don't enable it by default with -faddress-sanitizer. Maybe
the ASAN folks will want to add that after this lands, I leave it to them.

Please review!

Nick
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