[clang] [llvm] [AVR] Fix Avr indvar detection and strength reduction (missed optimization) (PR #152028)

[Ben Shi via cfe-commits]

================
@@ -112,8 +114,11 @@ while.end:                                        ; preds 
= %while.body, %entry
 
 define void @store16predec(ptr %x, i16 %y) {
 ; CHECK-LABEL: store16predec:
-; CHECK: st -{{[XYZ]}}, {{.*}}
-; CHECK: st -{{[XYZ]}}, {{.*}}
+; TODO: st -{{[XYZ]}}, {{.*}}
+; TODO: st -{{[XYZ]}}, {{.*}}
+; CHECK: sbiw {{..*}}, 2
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benshi001 wrote:

it would be better to show the register of `sbiw` is r26/r28/r30, something 
like   `sbiw [r26|r28|r30], 1`.

https://github.com/llvm/llvm-project/pull/152028
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