Commits on Oct 27, 2023

1. [AMDGPU] Try to fix the block prologs broken by RA inserted instructions …

   The insertion point determined by RA while attempting spills and liverange
   split at the beginning of a block goes wrong at times, and the newly
   inserted vector instructions are placed before the exec-mask restore
   instruction which is wrong. It occurs mainly due to the dependency on
   isBasicBlockPrologue that doesn't account early inserted instructions
   (spills and splits) during RA and causes the block prolog break.
   
   A better approach for deciding the insertion point should be worked out.
   For now, improving the helper function to consider all possible early
   insertions. This patch includes the spill instructions. The copies
   associated with liverange split should also be included in the block
   prolog.

   

   cdevadas committed Oct 27, 2023
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