[llvm-bugs] [Bug 38292] New: [windows] The VS compiler optimizes out fieldFromInstruction in Release builds when LLVM_ENABLE_ASSERTIONS is set to OFF

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https://bugs.llvm.org/show_bug.cgi?id=38292

            Bug ID: 38292
           Summary: [windows] The VS compiler optimizes out
                    fieldFromInstruction in Release builds when
                    LLVM_ENABLE_ASSERTIONS is set to OFF
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: TableGen
          Assignee: unassignedbugs at nondot.org
          Reporter: stilis at microsoft.com
                CC: llvm-bugs at lists.llvm.org

The VS compiler (on Windows) has a bug which results in fieldFromInstruction
being optimized out in some circumstances. This only happens in *release no
debug info* builds that have assertions *turned off* - in all other situations
the function is not inlined, so the functionality is correct.

All of the bots have assertions turned on, so this path is not regularly
tested. 

The workaround is to not inline the function on Windows - if the bug is fixed
in a later release of the VS compiler, the noinline specification can be
removed.

The test that consistently reproduces this is Lanai v11.txt test.

This bug is to track the workaround in FixedLenDecoderEmitter.cpp (and it's
potential future removal).

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