Commits on Jun 7, 2022

1. Fix unwind info when fake-splitting …

   Fake-splitting currently breaks stack walks by not generating unwind
   info for cold code. This commit implements unwind info on x86/64 when
   fake-splitting by generating unwind info for the combined hot/cold
   section just once, rather than generating unwind info for the separate
   sections.
   
   For reasons to be investigated, this implementation does not work when
   the code sections are separated by an arbitrary buffer (such as the 4KB
   buffer previously used). Thus, the buffer has been removed from the
   fake-splitting implementation: Now, the hot and cold sections are
   placed contiguously in memory, but the JIT continues to behave as if
   they are arbitrarily far away (for example, by using long branches
   between sections).
   
   Following this fix, fake-splitting no longer requires the GC to be
   suppressed by setting `COMPlus_GCgen0size=1000000`. A test job
   has been added to `runtime-jit-experimental` to ensure
   fake/stress-splitting does not regress.

   Aman Khalid committed Jun 7, 2022
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