Jit doesn't always eliminate identical checks #11909
Description
Double check is via outer method (first) and then inlined method (second, Span .ctor)
Seen in dotnet/coreclr#22207 (comment)
; Assembly listing for method String:EndsWith(ref,int):bool:this
...
G_M23680_IG10:
mov ecx, dword ptr [rsi+8]
sub ecx, r8d
cmp dword ptr [rsi+8], ecx ; should eliminate one below?
jb SHORT G_M23680_IG15
cmp dword ptr [rsi+8], ecx ; should be eliminated?
jb G_M23680_IG22
G_M23680_IG11:/cc @AndyAyersMS
category:cq
theme:basic-cq
skill-level:expert
cost:medium
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