clang: Locally apply https://reviews.llvm.org/D36596 to see what it does to minidumps.

This changes how we emit debug info. We now emit debug info for locals in optimized
build more often (fewer "optimized away" messages), but in return the displayed data
for a variable might sometimes be stale.  The motivation is to collect data on which
tradeoff feels better.

Bug: 753736
Change-Id: I009f444a7b030b18751bcef31188e7db4b9a8584
Reviewed-on: https://chromium-review.googlesource.com/616267
Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#494864}
2 files changed