[llvm] [WIP][SPARC] Allow overaligned `alloca`s (PR #107223)

[Sergei Barannikov via llvm-commits]

================
@@ -35,7 +35,8 @@ DisableLeafProc("disable-sparc-leaf-proc",
 SparcFrameLowering::SparcFrameLowering(const SparcSubtarget &ST)
     : TargetFrameLowering(TargetFrameLowering::StackGrowsDown,
                           ST.is64Bit() ? Align(16) : Align(8), 0,
-                          ST.is64Bit() ? Align(16) : Align(8)) {}
+                          ST.is64Bit() ? Align(16) : Align(8),
+                          /* StackRealignable */ false) {}
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s-barannikov wrote:

The conventional style is:
```suggestion
                          /*StackRealignable=*/false) {}
```

https://github.com/llvm/llvm-project/pull/107223