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Extend PGO support from VC++ on WIN32 to Clang/LLVM on UNIX as well.
* Just like on Windows: if profile data is missing, skip enabling PGO
(allows non-PGO builds in branches where we don't publish PGO data).
* PGO with LTO requires additional dependencies (namely a discoverable
`ld.gold` and `LLVMgold.so`). To protect against broken support and
keep the build flexible across a wider array of distros, attempt to
detect whether PGO compilation would work (using cmake's
`try_compile()`), and fall back to a non-PGO/non-LTO build if the test
fails.
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The bulk of this PR is a cherry-pick of commit fa02660 that shipped in
release/1.1.0, updating the build system support for PGO to support
consuming PGDs properly during release builds on Windows.
Also included are the following new changes:
* Skip restore of opdata if the requisite project.json is missing
* If the optdata package restore fails, fail the build.
* Add new build option: 'skiprestoreoptdata'
Note: This change doesn't by itself enable PGO in master yet, because
training data (optdata packages) for master don't exist on myget yet.
However, with these changes, the only step remaining to enable PGO
optimizations is to add a project.json referencing the correct optdata
package.
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* Add PGO GENPROFILE support to coreclr and clrjit
Update the cmake build system to enable support for Profile Guided
Optimization (PGO) on Windows, and enable this feature for two target
binaries (coreclr and clrjit).
With this change, toggle between instrumented and profile-optimized
settings for target binaries by passing pgoinstrument argument to the build.cmd
Assume profile-optimized mode by default. Fall back to regular non-PGO
optimized builds if profile data is not available.
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