[llvm] [AMDGPU] add missing checks in processBaseWithConstOffset (PR #102310)

[Tim Gymnich via llvm-commits]

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@@ -447,3 +447,33 @@ body:             |
     %13:vreg_64 = REG_SEQUENCE %9, %subreg.sub0, %11, %subreg.sub1
     %15:vgpr_32 = FLAT_ATOMIC_ADD_RTN %13:vreg_64, %0.sub0, 0, 0, implicit $exec, implicit $flat_scr
 ...
+
+---
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tgymnich wrote:

Thanks. Committed the above and verified that it crashes without this patch.

https://github.com/llvm/llvm-project/pull/102310