[llvm] [DAGCombine] `visitANY_EXTEND` - fold `(aext (freeze (load x)))` -> `(aext (truncate (freeze (extload x))))` (PR #218454)

[Simon Pilgrim via llvm-commits]

================
@@ -37,8 +37,8 @@ define i8 @test_i8(i8 %a) nounwind {
 define i16 @test_i16(i16 %a) nounwind {
 ; X86-NO-CMOV-LABEL: test_i16:
 ; X86-NO-CMOV:       # %bb.0:
-; X86-NO-CMOV-NEXT:    movswl {{[0-9]+}}(%esp), %eax
-; X86-NO-CMOV-NEXT:    movl %eax, %ecx
+; X86-NO-CMOV-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NO-CMOV-NEXT:    movswl %ax, %ecx
----------------
RKSimon wrote:

Avoid a PR stack - you should make the yak shave PR independent of this one.

https://github.com/llvm/llvm-project/pull/218454