[llvm] Cleanup x86_mmx after removing IR type (PR #100646)

[Phoebe Wang via llvm-commits]

================
@@ -14,13 +14,13 @@ define void @foo(<1 x i64> %A, <1 x i64> %B) nounwind {
 ; CHECK-NEXT:    emms
 ; CHECK-NEXT:    retq
 entry:
-	%tmp4 = bitcast <1 x i64> %B to x86_mmx		; <<4 x i16>> [#uses=1]
-	%tmp6 = bitcast <1 x i64> %A to x86_mmx		; <<4 x i16>> [#uses=1]
-	%tmp7 = tail call x86_mmx @llvm.x86.mmx.paddus.w( x86_mmx %tmp6, x86_mmx %tmp4 )		; <x86_mmx> [#uses=1]
-	store x86_mmx %tmp7, ptr @R
+	%tmp4 = bitcast <1 x i64> %B to <1 x i64>		; <<4 x i16>> [#uses=1]
+	%tmp6 = bitcast <1 x i64> %A to <1 x i64>		; <<4 x i16>> [#uses=1]
----------------
phoebewang wrote:

Can we remove such `bitcast <1 x i64>.*to <1 x i64>`?

https://github.com/llvm/llvm-project/pull/100646