[llvm] [AMDGPU] Enable more consecutive load folding during aggressive-instcombine (PR #158036)

[Matt Arsenault via llvm-commits]

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@@ -2090,10 +2090,16 @@ bool SITargetLowering::allowsMisalignedMemoryAccessesImpl(
   if (AddrSpace == AMDGPUAS::PRIVATE_ADDRESS ||
       AddrSpace == AMDGPUAS::FLAT_ADDRESS) {
     bool AlignedBy4 = Alignment >= Align(4);
+    if (Subtarget->hasUnalignedScratchAccessEnabled()) {
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arsenm wrote:

Can you change the title to describe this is changing reporting of fast unaligned access, and mention the consequence in the longer description 

https://github.com/llvm/llvm-project/pull/158036