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Corrects a problem with the inline assembly formatting on Windows
(Clang's assembler behaves differently with line-breaks vs semi-colons
on Windows than it does on other systems - was incorrectly squashing
nops). It also ensures that the right number of instructions are
skipped to avoid an instruction alignment crash when the linker's
configured incorrectly.

Bug: 1108769
Change-Id: I1f1f1ac7866c72d62068ad1db87f12c08204303c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320570Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Cr-Commit-Position: refs/heads/master@{#792378}